Regulation No. 110-01

Name:Regulation No. 110-01
Description:Compressed Natural Gas (CNG) and/or Liquefied Natural Gas (LNG) Vehicles.
Official Title:Uniform Provisions Concerning the Approval of: I. Specific Components of Motor Vehicles Using Compressed Natural Gas (CNG) and/or Liquefied Natural Gas (LNG) in their Propulsion System; II. Vehicles with Regard to the Installation of Specific Components of an Approved Type for the Use of Compressed Natural Gas (CNG) and/or Liquefied Natural Gas (LNG) in their Propulsion System.
Country:ECE - United Nations
Date of Issue:2013-08-19
Amendment Level:01 Series, Supplement 4
Number of Pages:212
Vehicle Types:Bus, Car, Component, Heavy Truck, Light Truck
Subject Categories:Prior Versions
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Keywords:

pressure, test, annex, lng, temperature, cylinder, valve, paragraph, type, gas, cng, material, requirements, approval, cylinders, working, design, accordance, maximum, tensile, iso, tests, fuel, tank, regulation, appendix, system, service, strength, relief, components, elongation, operating, natural, change, manufacturer, temperatures, minimum, hose, conditions, means, burst, provisions, mpa, vehicle, component, break, resistance, device, flow

Text Extract:

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E/ECE/324
) Rev 2/Add.109/Rev.3/Amend.3
E/ECE/TRANS/505 )
July 11, 2016
STATUS OF UNITED NATIONS REGULATION
ECE 110-01
UNIFORM PROVISIONS CONCERNING THE APPROVAL OF:
I. SPECIFIC COMPONENTS OF MOTOR VEHICLES USING COMPRESSED NATURAL
GAS (CNG) AND/OR LIQUEFIED NATURAL GAS (LNG) IN THEIR PROPULSION
SYSTEM;
II.
VEHICLES WITH REGARD TO THE INSTALLATION OF SPECIFIC COMPONENTS
OF AN APPROVED TYPE FOR THE USE OF COMPRESSED NATURAL GAS (CNG)
AND/OR LIQUEFIED NATURAL GAS (LNG) IN THEIR PROPULSION SYSTEM
Incorporating:
00 series of amendments
Date of Entry into Force: 28.12.00
Corr. 1 to the 00 series of amendments
Dated : 08.11.00
Corr. 2 to the 00 series of amendments
Dated: 27.06.01
Supplement 1 to the 00 series of amendments
Date of Entry into Force: 31.01.03
Supplement 2 to the 00 series of amendments
Date of Entry into Force: 27.02.04
Supplement 3 to the 00 series of amendments
Date of Entry into Force: 12.08.04
Supplement 4 to the 00 series of amendments
Date of Entry into Force: 04.07.06
Supplement 5 to the 00 series of amendments
Date of Entry into Force: 02.02.07
Supplement 6 to the 00 series of amendments
Date of Entry into Force: 18.06.07
Supplement 7 to the 00 series of amendments
Date of Entry into Force: 03.02.08
Supplement 8 to the 00 series of amendments
Date of Entry into Force: 22.07.09
Supplement 9 to the 00 series of amendments
Date of Entry into Force: 19.08.10
01 series of amendments
Date of Entry into Force: 15.07.13
Supplement 1 to the 01 series of amendments
Date of Entry into Force: 10.06.14
Supplement 2 to the 01 series of amendments
Date of Entry into Force: 09.10.14
Supplement 3 to the 01 series of amendments
Date of Entry into Force: 08.10.15
Supplement 4 to the 01 series of amendments
Date of Entry into Force: 18.06.16

REGULATION No. 110-01
UNIFORM PROVISIONS CONCERNING THE APPROVAL OF:
I. SPECIFIC COMPONENTS OF MOTOR VEHICLES USING COMPRESSED NATURAL
GAS (CNG) AND/OR LIQUEFIED NATURAL GAS (LNG) IN THEIR PROPULSION SYSTEM;
II.
VEHICLES WITH REGARD TO THE INSTALLATION OF SPECIFIC COMPONENTS OF AN
APPROVED TYPE FOR THE USE OF COMPRESSED NATURAL GAS (CNG) AND/OR
LIQUEFIED NATURAL GAS (LNG) IN THEIR PROPULSION SYSTEM
CONTENTS
REGULATION
1.
Scope
2.
References
3.
Classification of Components
4.
Definitions
PART I – APPROVAL OF SPECIFIC COMPONENTS OF MOTOR VEHICLES USING COMPRESSED
NATURAL GAS (CNG) AND/OR LIQUEFIED NATURAL GAS (LNG) IN THEIR
PROPULSION SYSTEM
5
Application for Approval
6.
Markings
7.
Approval
8.
Specifications Regarding CNG and/or LNG Components
9.
Modifications of a Type of CNG and/or LNG Component and Extension of Approval
10.
(Not allocated)
11.
Conformity of Production
12.
Penalties for Non-conformity of Production
13.
(Not allocated)
14.
Production Definitively Discontinued
15.
Names and Addresses of Technical Services Responsible For Conducting Approval Tests, and of
Type Approval Authorities
PART II – APPROVAL OF VEHICLES WITH REGARD TO THE INSTALLATION OF SPECIFIC
COMPONENTS OF AN APPROVED TYPE FOR THE USE OF COMPRESSED NATURAL
GAS (CNG) AND/OR LIQUEFIED NATURAL GAS (LNG) IN THEIR PROPULSION
SYSTEM
16.
Application for Approval
17.
Approval
18.
Requirements for the Installation of Specific Components for the Use of Compressed Natural Gas
and/or Liquefied Natural Gas in the Propulsion System of a Vehicle
19.
Conformity of Production
20.
Penalties for Non-conformity of Production
21.
Modification and Extension of Approval of a Vehicle Type
22.
Production Definitively Discontinued
23.
Names and Addresses of Technical Services Responsible for Conducting Approval Tests, and of
Type Approval Authorities
24.
Transitional Provisions

Annex 5 – Test Procedures
Annex 5A – Overpressure Test (Strength Test)
Annex 5B – External Leakage Test
Annex 5C – Internal Leakage Test
Annex 5D – CNG/LNG Compatibility Test
Annex 5E – Corrosion Resistance Test
Annex 5F – Resistance to Dry Heat
Annex 5G – Ozone Ageing
Annex 5H – Temperature Cycle Test
Annex 5I – Pressure Cycle Test Applicable Only to Cylinders
Annex 5J – (Not Allocated)
Annex 5K – (Not Allocated)
Annex 5L – Durability Test (Continued Operation)
Annex 5M – Burst/Destructive Test Applicable Only to CNG Cylinders
Annex 5N – Vibration Resistance Test
Annex 5O – Operating Temperatures
Annex 5P – LNG – Low Temperature Test
Annex 5Q – Compatibility with Heat Exchange Fluids of Non-Metallic Parts
Annex 6 – Provisions on CNG Identification Mark for Vehicles of Categories M and M , N and N
Annex 7 – Provisions on LNG Identification Mark for Vehicles of Categories M and M , N and N

ASTM E647-93
ASTM E813-89
ASTM G53-93
Standard Test Method for Measurement of Fatigue Crack Growth
Rates;
Test Method for J , a Measure of Fracture Toughness;
Standard Practice for Operating Light and Water - Exposure
Apparatus (Fluorescent UV-Condensation Type) for Exposure of
non-metallic materials
BSI Standards
BS 5045:
BS 7448-91
Part 1 (1982) Transportable Gas Containers - Specification for
Seamless Steel Gas Containers Above 0.5l Water Capacity
Fracture Mechanics Toughness Tests Part I - Method for
Determination of K , Critical COD and Critical J Values of BS PD
6493-1991. Guidance and Methods for Assessing the A
Acceptability of Flaws in Fusion Welded Structures; Metallic
Materials
EN Standards
EN 13322-2-2003
EN ISO 5817-2003
EN1251-2 2000
EN 895:1995
EN 910:1996
EN 1435:1997
EN 6892-1:2009
Transportable gas cylinders − Refillable welded steel gas
cylinders − Design and construction − Part 2: Stainless steel
Arc-welded joints in steel; guidance on quality levels for
imperfections.
Cryogenic vessels. Vacuum insulated vessels of not more than
1,000 litres volume
Destructive tests on welds in metallic materials. Transverse tensile
test
Destructive test methods on welds in metallic materials. Bend
tests
Non-destructive examination of welds. Radiographic examination
of welded joints
Metallic materials. Tensile test
EN 10045-1:1990 Charpy impact test on metallic materials. Test method (V- and U-
notches)

ISO 6508-1986
ISO 7225
ISO/DIS 7866-1992
ISO 9001:1994
ISO 9002:1994
ISO/DIS 12737
ISO12991
ISO14469-1:2004
ISO14469-2:2007
ISO15500
ISO 21028-1:2004
ISO 21029-1:2004
Metallic Materials – Hardness Tests – Rockwell Test (Scales,
ABCDEFGHK)
Precautionary Labels for Gas Cylinders
Refillable Transportable Seamless Aluminium Alloy Cylinders for
Worldwide Usage Design, Manufacture and Acceptance
Quality Assurance in Design/Development. Production, Installation
and Servicing
Quality Assurance in Production and Installation
Metallic Materials – Determination of the Plane-Strain Fracture
Toughness
Liquefied natural gas (LNG) – transportable tanks for use on board
of vehicles
Road Vehicles: compressed natural gas CNG refuelling connector:
Part I: 20MPa (200bar) connector
Road Vehicles: compressed natural gas CNG refuelling connector:
Part II: 20MPa (200bar) connector
Road vehicles – Compressed natural gas (CNG) fuel system
components
Cryogenic vessels – Toughness requirements for materials at
cryogenic temperature – Part I: Temperatures below -80°C
Cryogenic vessels – Transportable vacuum insulated vessels of
not more than 1,000 litres volume – Part I: Design, fabrication,
inspection and tests
ISO/IEC Guide 25-1990 General requirements for the Technical Competence of Testing
Laboratories
ISO/IEC Guide 48-1986 Guidelines for Third Party Assessment and Registration of
Supplies Quality System
ISO/DIS 9809 Transportable Seamless Steel Gas Cylinders Design,
Construction and Testing – Part I: Quenched and Tempered Steel
Cylinders with Tensile Strength <1,100MPa
ISO 11439
Gas cylinders – High pressure cylinders for the on-board storage
of natural gas as a fuel for automotive vehicles

Figure 1-1
Flow Scheme for CNG and/or LNG Components Classification

4.5. "Operating temperatures" means maximum values of the temperature ranges, indicated in
Annex 5O, at which safe and good functioning of the specific component is ensured and for
which it has been designed and approved.
4.6. "Specific components" means:
(a)
(b)
(c)
(d)
(e)
(f)
(g)
(h)
(i)
(j)
(k)
(l)
(m)
(n)
(o)
(p)
(q)
(r)
(s)
(t)
(u)
(v)
(w)
(x)
(y)
(z)
Container (cylinder or tank);
Accessories fitted to the container;
Pressure regulator;
Automatic valve;
Manual Valve;
Gas supply device;
Gas flow adjuster;
Flexible fuel line;
Rigid fuel line;
Filling unit or receptacle;
Non-return valve or check valve;
Pressure relief valve (discharge valve) primary and secondary;
Pressure Relief device (temperature triggered);
Filter;
Pressure or temperature sensor/indicator;
Excess flow valve;
Service valve;
Electronic control unit;
Gas-tight housing;
Fitting;
Ventilation hose;
Pressure relief device (PRD) (pressure triggered);
Fuel rail.
Heat exchanger/vaporizer;
Natural gas detector;
Fuel pump (for LNG)

4.16. "Accessories fitted to the container or tank" means the following components (but not
limited to them), either separate or combined, when fitted to the container or tank:
4.16.1 "Manual valve" means a valve which is operated manually.
4.16.2. "Pressure sensor/indicator" means a pressurised device which indicates the gas or liquid
pressure.
4.16.3. "Excess flow valve" means valve which automatically shuts off or limits, the gas flow when
the flow exceeds a set design value.
4.16.4. "Gas-tight housing" means a device that vents gas leakage to outside the vehicle including
the gas ventilation hose.
4.17. "Valve" means a device by which the flow of a fluid may be controlled.
4.18. "Automatic valve" means a valve that is not operated manually.
4.19. "Automatic cylinder valve" means an automatic valve rigidly fixed to the cylinder that
controls the flow of gas to the fuel system. The automatic cylinder valve is also called
remote-controlled service valve.
4.20. "Non-return valve or check valve" means an automatic valve that allows gas to flow in
only one direction.
4.21 "Excess flow valve" (excess flow limiting device) means a device that automatically shuts
off, or limits, the gas flow or liquid flow when the flow exceeds a set design value.
4.22. "Manual valve" means a manual valve rigidly fixed to the cylinder or tank.
4.23. "Pressure relief valve (discharge valve)" means a device that prevents a pre-determined
upstream pressure being exceeded.
4.24 "Service valve" means an isolation valve that is closed only when servicing the vehicle.
4.25. "Filter" means a protective screen that removes foreign debris from the gas or liquid
stream.
4.26. "Fitting" means a connector used in a piping, tubing, or hose system.
4.27. "LNG fuel pump" means a device to establish the supply of LNG to the engine by
increasing the pressure of the fluid (liquid or vapour).
4.28 "Flexible fuel lines" mean a flexible tubing or hose through which natural gas flows.
4.29. "Rigid fuel lines" mean a tubing that has not been designed to flex in normal operation and
through which natural gas flows.
4.30. "Gas supply device" means a device for introducing gaseous fuel into the engine intake
manifold (carburettor or injector).
4.31. "Gas/air mixer" means a device for mixing the gaseous fuel and intake air for the engine.

4.48. "Auto-frettage pressure" means the pressure within the over-wrapped cylinder at which
the required distribution of stresses between the liner and the over-wrap is established.
4.49. "Batch - composite cylinders" means a "batch" i.e. a group of cylinders successively
produced from qualified liners having the same size, design, specified materials of
construction and process of manufacture.
4.50. "Batch - metal cylinders and liners" means a "batch" i.e. a group of metal cylinders or
liners successively produced having the same nominal diameter, wall thickness, design,
specified material of construction, process of manufacture, equipment for manufacture and
heat treatment, and conditions of time, temperature and atmosphere during heat treatment.
4.51. "Batch non-metallic liners" means a "batch" i.e. a group of non-metallic liners
successively produced having the same nominal diameter, wall thickness, design specified
material of construction and process of manufacture.
4.52. "Batch limits" means in no case a "batch" shall be permitted to exceed 200 finished
cylinders or liners (not including destructive test cylinders or liners), or one shift of
successive production, whichever is greater.
4.53. "Composite cylinder" means a cylinder made of resin impregnated continuous filament
wound over a metallic or non-metallic liner. Composite cylinders using non-metallic liners
are referred to as all-composite cylinders.
4.54. "Controlled tension winding" means a process used in manufacturing hoop wrapped
composite cylinders with metal liners by which compressive stresses in the liner and tensile
stresses in the over-wrap at zero internal pressure are obtained by winding the reinforcing
filaments under significant high tension.
4.55. "Filling pressure" means the gas pressure in the cylinder immediately upon completion of
filling.
4.56. "Finished cylinders" means completed cylinders that are ready for use, typical of normal
production, complete with identification marks and external coating including integral
insulation specified by the manufacturer, but free from non-integral insulation or protection.
4.57. "Full-wrap" means an over-wrap having a filament wound reinforcement both in the
circumferential and axial direction of the cylinder.
4.58. "Gas temperature" means the temperature of gas in a cylinder.
4.59. "Hoop-wrap" means an over-wrap having a filament wound reinforcement in a substantially
circumferential pattern over the cylindrical portion of the liner so that the filament does not
carry any significant load in a direction parallel to the cylinder longitudinal axis.
4.60. "Liner" means a container that is used as a gas-tight, inner shell, on which reinforcing
fibres are filament wound to reach the necessary strength. Two types of liners are described
in this standard: Metallic liners that are designed to share the load with the reinforcement,
and non-metallic liners that do not carry any part of the load.
4.61. "Manufacturer" means the person or organization responsible for the design, fabrication
and testing of CNG or LNG specific components.

PART I
APPROVAL OF SPECIFIC COMPONENTS OF MOTOR VEHICLES USING
COMPRESSED NATURAL GAS (CNG) AND/OR LIQUEFIED NATURAL
GAS (LNG) IN THEIR PROPULSION SYSTEM
5. APPLICATION FOR APPROVAL
5.1. The application for approval of specific component or multifunctional component shall be
submitted by the holder of the trade name or mark or by his duly accredited representative.
5.2. It shall be accompanied by the under-mentioned documents in triplicate and by the following
particulars:
5.2.1. Description of the vehicle comprising all the relevant particulars referred to in Annex 1A to
this Regulation,
5.2.2. A detailed description of the type of the specific component or multifunctional components;
5.2.3. A drawing of the specific component or multifunctional components, sufficiently detailed and
on an appropriate scale;
5.2.4. Verification of compliance with the specifications prescribed in Paragraph 8. of this
Regulation.
5.3. At the request of the Technical Service responsible for conducting approval tests, samples
of the specific component or multifunctional components shall be provided. Supplementary
samples shall be supplied upon request (3 maximum)
5.3.1. During pre-production of containers [n] , containers of each 50 pieces (lot of qualification)
shall be subject to non-destructive tests of Annex 3A. For LNG tanks see Annex 3B.
6 MARKINGS
6.1. The sample of specific component or multifunctional components submitted for approval
shall bear the trade name or mark of the manufacturer and the type, including one
concerning designation regarding operating temperatures ("M" or "C" for moderate or cold
temperatures "L" for LNG as appropriate); and for flexible hoses also the manufacturing
month and year; this marking shall be clearly legible and indelible.
6.1.1. In addition to provisions of Paragraph 6.1., one of the following additional marks shall be
used for automatic cylinder valve which comply with Paragraph 2.2.4. of Annex 4A:
(a)
(b)
(c)
"H1"
"H2"
"H3"
6.2. All components shall have a space large enough to accommodate the approval mark; this
space shall be shown on the drawings referred to in Paragraph 5.2.3. above.

7.2. An approval number shall be assigned to each type of component or multifunctional
component approved. Its first two digits (at present 01 corresponding to the 01 series of
amendments) shall indicate the series of amendments incorporating the most recent major
technical amendments made to the Regulation at the time of issue of the approval. The
same Contracting Party shall not assign the same alphanumeric code to another type of
component.
7.3. Notice of approval or of refusal or of extension of approval of a CNG or LNG component
type pursuant to this Regulation shall be communicated to the Parties to the Agreement
applying this Regulation, by means of a form conforming to the model in Annex 2B to this
Regulation.
7.4. There shall be affixed, conspicuously and in the space referred to in Paragraph 6.2. above,
to all components conforming to a type-approved under this Regulation, in addition to the
mark prescribed in Paragraphs 6.1. and 6.3. (CNG) and 6.4 (LNG), an international approval
mark consisting of:
7.4.1. A circle surrounding the Letter "E" followed by the distinguishing number of the country
which has granted approval .
7.4.2.. The number of this Regulation, followed by the Letter "R", a dash and the approval number
to the right of the circle prescribed in Paragraph 7.4.1. above. This approval number
consists of the component type-approval number which appears on the certificate
completed for this type (see Paragraph 7.2. above. and Annex 2B) preceded by two figures
indicating the sequence of the latest series of amendments to this Regulation.
7.5. The approval mark shall be clearly legible and be indelible.
7.6. Annex 2A to this Regulation gives examples of the arrangement of the aforesaid approval
mark.
8 SPECIFICATIONS ON CNG AND LNG COMPONENTS
8.1. General Provisions
8.1.1. The specific components of vehicles using CNG and/or LNG in their propulsion system shall
function in a correct and safe way as specified in this Regulation.
The materials of the components that are in contact with CNG/LNG shall be compatible with
it (see Annex 5D).
Those parts of component whose correct and safe functioning is liable to be influenced by
CNG/LNG, high pressure or vibrations has to be submitted to relevant test procedures
described in the annexes to this Regulation. In particular the provisions of Paragraphs 8.2.
to 8.11. are to be fulfilled for CNG components. For LNG components, the provisions of
Paragraphs 8.12. to 8.21. shall be fulfilled.
The specific components of vehicles using CNG/LNG in their propulsion system shall
comply with relevant electromagnetic compatibility (EMC) requirements according to
Regulation No. 10, 03 series of amendments, or equivalent.

8.13. Provisions on Components Fitted to the LNG Tank
8.13.1. The LNG tank shall be equipped at least with the following components, which may be
either separate or combined (special care shall be taken to prevent LNG trapping):
8.13.1.1. Pressure relief valve;
8.13.1.2. Manual valve;
8.13.1.3. Automatic valve;
8.13.1.4. Excess flow device.
8.13.2. The tank may be equipped with a gas-tight housing, if necessary.
8.13.3. The components mentioned in Paragraphs 8.13.1.1. to 8.13.1.4. above shall be type
approved pursuant to the provisions laid down in Annex 4 to this Regulation.
8.14.-8.22. Provisions Regarding Other LNG Components
The components shown shall be type approved pursuant to the provisions laid down in the
annexes which can be determined from the table below:
Paragraph Component Annex
8.15. LNG heat exchanger – vaporizer 4I
8.16. LNG filling receptacle 4J
8.17. Pressure control regulator 4K
8.18. LNG Pressure and/or temperature sensor/indicator 4L
8.19. Natural gas detector 4M
8.20.
Automatic valve, check valve, the pressure relief valve,
excess flow valve, manual valve and non-return valve.
8.21. Fuel pump 4O
8.22. Electronic control unit 4H
4N
9. MODIFICATIONS OF A TYPE OF CNG AND/OR LNG COMPONENT AND EXTENSION
OF APPROVAL
9.1. Every modification of a type of CNG and/or LNG component shall be notified to the Type
Approval Authority that granted the type-approval. The Type Approval Authority may then
either:
9.1.1. Consider that the modifications made are unlikely to have an appreciable adverse effect,
and that the component still complies with the requirements; or
9.1.2. Determine whether partial or complete retesting has to be established by the Type Approval
Authority.

PART II
APPROVAL OF VEHICLES WITH REGARD TO THE INSTALLATION OF SPECIFIC
COMPONENTS OF AN APPROVED TYPE FOR THE USE OF COMPRESSED
NATURAL GAS (CNG) AND/OR LIQUEFIED NATURAL GAS (LNG) IN
THEIR PROPULSION SYSTEM
16. APPLICATION FOR APPROVAL
16.1. The application for approval of a vehicle type with regard to the installation of specific
components for the use of compressed natural gas (CNG) and/or liquefied natural gas
(LNG) in its propulsion system shall be submitted by the vehicle manufacturer or by his duly
accredited representative.
16.2. It shall be accompanied by the under-mentioned documents in triplicate: description of the
vehicle comprising all the relevant particulars referred to in Annex 1B to this Regulation.
16.3. A vehicle representative of the vehicle type to be approved, shall be submitted to the
Technical Service conducting the approval tests.
17. APPROVAL
17.1. If the vehicle submitted for approval pursuant to this Regulation is equipped with all the
necessary specific components for the use of compressed natural gas (CNG) and/or
liquefied natural gas (LNG) in its propulsion system and meets the requirements of
Paragraph 18. below, approval of that vehicle type shall be granted.
17.2. An approval number shall be assigned to each type of vehicle approved. Its first two digits
shall indicate the series of amendments incorporating the most recent major technical
amendments made to the Regulation at the time of issue of the approval.
17.3. Notice of approval or of refusal or of extension of approval of a CNG and/or LNG vehicle
type pursuant to this Regulation shall be communicated to the Parties to the Agreement
applying this Regulation, by means of a form conforming to the model in Annex 2D to this
Regulation.
17.4. There shall be affixed, conspicuously and in a readily accessible space specified on the
approval form referred to in Paragraph 17.2. above, to every vehicle type-approved under
this Regulation an international approval mark consisting of:
17.4.1. A circle surrounding the Letter "E" followed by the distinguishing number of the country
which has granted approval ;
17.4.2. The number of this Regulation, followed by the Letter "R", a dash and the approval number
to the right of the circle prescribed in Paragraph 17.4.1.

18.1.7.2. The heating system referred to in Paragraph 18.1.7.1. shall be permitted if, in the view of the
Technical Services responsible for conducting type-approval, the heating system is
adequately protected and the required operation of the normal CNG and/or LNG system is
not affected.
18.1.8. Identification of CNG-and/or LNG Fuelled Vehicles
18.1.8.1. Vehicles of Categories M and M equipped with a CNG system shall be labelled as
specified in Annex 6.
18.1.8.2. Vehicles of Categories M and M equipped with a LNG system shall be labelled as
specified in Annex 7.
18.1.8.3. The label shall be installed on the front and rear of the vehicle of Category M or M and on
the outside of the doors on the right-hand side. (left hand drive vehicles), left-hand side
(right hand drive vehicles).
18.1.8.4. A label shall be placed adjacent to the LNG fill receptacle stating the fuelling requirements.
The fuelling requirements shall be as recommended by the manufacturer.
18.2. Further Requirements
18.2.1. No component of the CNG and/or LNG system, including any protective materials which
form part of such components, shall project beyond the outline of the vehicle, with the
exception of the filling unit if this does not project more than 10mm beyond its point of
attachment.
18.2.2. Proper shielding against heat of adjacent components shall be considered and no
component of the CNG and/or LNG system shall be located within 100mm of the exhaust or
similar heat source, unless such components are adequately shielded against heat.
18.3. The CNG System
18.3.1. A CNG system shall contain at least the following components:
18.3.1.1. Container(s) or cylinder(s);
18.3.1.2. Pressure indicator or fuel level indicator;
18.3.1.3. Pressure relief device (temperature triggered);
18.3.1.4. Automatic cylinder valve;
18.3.1.5. Manual valve;
18.3.1.6. Pressure regulator;
18.3.1.7. Gas flow adjuster;
18.3.1.8. Excess flow limiting device;
18.3.1.9. Gas supply device;

18.3.4.11. LNG check valve or non-return valve;
18.3.4.12. LNG pressure indicator or fuel indicator;
18.3.4.13. Electronic control unit;
18.3.4.14. Natural gas detector or gas tight housing, for category M vehicles.
18.3.5. The LNG system may also include the following components:
18.3.5.1. LNG pressure regulator;
18.3.5.2. LNG pressure and/or temperature sensor;
18.3.5.3. LNG fuel pump;
18.3.5.4. LNG level gauge;
18.3.5.5. Natural gas detector;
18.3.5.6. Gas tight housing.
18.3.6. LNG vehicles components downstream of the heat exchanger/vaporizer (gaseous phase)
shall be considered as CNG components.
18.4. Installation of the Container and/or Tanks
18.4.1. The container and/or tank shall be permanently installed in the vehicle and shall not be
installed in the engine compartment.
18.4.2. The container and/or tank shall be installed such that there is no metal to metal contact, with
the exception of the fixing points of the container(s) and/or tank(s)
18.4.3. When the vehicle is ready for use the fuel container and/or tank shall not be less than
200mm above the road surface.
18.4.3.1. The provisions of Paragraph 18.4.3. shall not apply if the container and/or tank is
adequately protected, at the front and the sides and no part of the container is located lower
than this protective structure.

18.5.5. Gas-tight Housing on the CNG Container(s)
18.5.5.1. A gas-tight housing over the CNG container(s) fittings, which fulfils the requirements of
Paragraphs 18.5.5.2. to 18.5.5.5. shall be fitted to the CNG fuel container, unless the CNG
container(s) is installed outside the vehicle.
18.5.5.2. The gas-tight housing shall be in open connection with the atmosphere, where necessary
through a connecting hose and a lead-through which shall be resistant against CNG.
18.5.5.3. The ventilation opening of the gas-tight housing shall not discharge into a wheel arch, nor
shall it be aimed at a heat source such as the exhaust.
18.5.5.4. Any connecting hose and lead-through in the bottom of the bodywork of the motor vehicle
for ventilation of the gas-tight housing shall have a minimum clear opening of 450mm .
18.5.5.5. The housing over the CNG container(s) fittings and connecting hoses shall be gas-tight at a
pressure of 10kPa without any permanent deformations. In these circumstances a leak not
exceeding 100cm /h may be accepted.
18.5.5.6. The connecting hose shall be secured by clamps, or other means, to the gas-tight housing
and the lead-through to ensure that a gas-tight joint is formed.
18.5.5.7. The gas-tight housing shall contain all the components installed into the luggage or
passenger compartment.
18.5.6. PRD (Pressure Triggered)
18.5.6.1. The PRD (pressure triggered) shall be activated and shall vent the gas independently from
the PRD (temperature triggered).
18.5.6.2. The PRD (pressure triggered) shall be fitted to the fuel container(s) in such a manner that it
can discharge into the gas-tight housing if that gas-tight housing fulfils the requirements of
Paragraph 18.5.5. above.
18.6. Accessories Fitted to the LNG Tanks
18.6.1. Automatic Valve
18.6.1.1. An automatic valve shall be installed in the fuel supply line, directly on every LNG tank (in a
protected position).
18.6.1.2. The automatic valve shall be operated such that the fuel supply is cut off when the engine is
switched off, irrespective of the position of the ignition switch, and shall remain closed while
the engine is not running. A delay of 2s is permitted for diagnostic.
18.6.1.3. Notwithstanding the provisions of Paragraph 18.6.1.2., the automatic valve may stay in an
open position during commanded stop phases.
18.6.1.4. If the automatic valve is closed during commanded stop phases, the valve shall comply with
Paragraph 2.2.4. of Annex 4A.
18.6.2. Excess Flow Valve
The excess flow valve can be fitted inside or directly on the LNG tank (in a protected
position).

18.7.3. CNG and LNG flexible fuel line shall fulfil the relevant requirement of Annex 4B to this
Regulation.
18.7.4. Rigid fuel lines, shall be secured such that they shall not be subjected to vibration or
stresses.
18.7.5. CNG and/or LNG flexible fuel lines shall be secured such that they shall not be subjected to
vibration or stresses.
18.7.6. At the fixing point, the fuel line, flexible or rigid, shall be fitted in such a way that there is no
metal to metal contact.
18.7.7. Rigid and flexible fuel gas line shall not be located at jacking points.
18.7.8. At passages the fuel lines shall be fitted with protective material.
18.7.9. LNG fuel line shall be insulated or protected in those areas where low temperature can
damage other components and/or harm people.
18.8. Fitting or Gas Connections Between the Components
18.8.1. Soldered joints and bite-type compression joints are not permitted for CNG. Bite-type
compression joints are not permitted for LNG.
18.8.2. Stainless steel tubes shall only be joined by stainless steel fittings.
18.8.3. Distributing-blocks for CNG shall be made of corrosion-resistant material.
18.8.4. Rigid fuel lines shall be connected by appropriate joints, for example, two-part compression
joints in steel tubes and joints with olives tapered on both sides.
18.8.5. The number of joints shall be limited to a minimum.
18.8.6. Any joints shall be made in locations where access is possible for inspection.
18.8.7. In a passenger compartment or enclosed luggage compartment the fuel lines shall be no
longer than reasonably required, and in any case shall be protected by a gas-tight housing.
18.8.7.1. The provisions of Paragraph 18.8.7. shall not apply to vehicles of Categories M or M
where the fuel lines and connections are fitted with a sleeve which is resistant against CNG
and that has an open connection to the atmosphere.
18.9. Automatic Valve
18.9.1. For CNG systems an additional automatic valve may be installed in the fuel line as close as
possible to the pressure regulator.
18.9.2. An automatic valve shall be installed as close as practicable after the vaporizer in the LNG
system.

21. MODIFICATION AND EXTENSION OF APPROVAL OF A VEHICLE TYPE
21.1. Every modification of the installation of the specific components for the use of compressed
natural gas and/or liquefied natural gas in the propulsion system of the vehicle shall be
notified to the Type Approval Authority that approved the vehicle type. The Type Approval
Authority may then either:
21.1.1. Consider that the modifications made are unlikely to have an appreciably adverse effect and
that in any case the vehicle still complies with the requirements; or
21.1.2. Require a further test report from the Technical Service responsible for conducting the tests.
21.2. Confirmation or refusal of approval, specifying the alteration, shall be communicated to the
Parties to the Agreement applying this Regulation by means of a form conforming to the
model in Annex 2D to this Regulation.
21.3. The Type Approval Authority issuing the extension of approval shall assign a series number
for such an extension and inform thereof the other Parties to the 1958 Agreement applying
this Regulation by means of a communication form conforming to the model in Annex 2D to
this Regulation.
22. PRODUCTION DEFINITIVELY DISCONTINUED
If the holder of the approval completely ceases to manufacture a type of vehicle approved in
accordance with this Regulation, he shall so inform the Type Approval Authority which
granted the approval. Upon receiving the relevant communication, that Authority shall inform
thereof the other Parties to the Agreement applying this Regulation by means of a
communication form conforming to the model in Annex 2D to this Regulation.
23. NAMES AND ADDRESSES OF TECHNICAL SERVICES RESPONSIBLE FOR
CONDUCTING APPROVAL TESTS, AND OF TYPE APPROVAL AUTHORITIES
The Parties to the Agreement applying this Regulation shall communicate to the United
Nations Secretariat the names and addresses of the Technical Services responsible for
conducting approval tests and of the Type Approval Authorities which grant approval and to
which forms certifying approval or extension or refusal or withdrawal of approval, issued in
other countries, are to be sent.
24. TRANSITIONAL PROVISIONS
24.1. As from the official date of entry into force of the 01 series of amendments to this
Regulation, no Contracting Party applying this Regulation shall refuse to grant or refuse to
accept type approval under this Regulation as amended by the 01 series of amendments.
24.2. As from 12 months after the date of entry into force of the 01 series of amendments to this
Regulation, Contracting Parties applying this Regulation shall grant approvals only if the
type of components to be approved meets the requirements of Part I of this Regulation as
amended by the 01 series of amendments to this Regulation.
24.3. Type approvals of components other than fuel rail, as defined in Paragraph 4.74., granted
according to the original version of this Regulation, shall remain valid and shall be accepted
for the purpose of their installation on vehicles.

ANNEX 1A
ESSENTIAL CHARACTERISTICS OF THE CNG/LNG COMPONENTS
1.
(Not allocated)
1.2.4.5.1.
System description:
1.2.4.5.2.
Pressure regulator(s):
yes/no
1.2.4.5.2.1.
Make( s): ...............................................................................................................................
1.2.4.5.2.2.
Type( s): ................................................................................................................................
1.2.4.5.2.5.
Drawings: ..............................................................................................................................
1.2.4.5.2.6.
Number of main adjustment points .......................................................................................
1.2.4.5.2.7.
Description of principle of adjustment through main adjustment points: ..............................
1.2.4.5.2.8.
Number of idle adjustment points: ........................................................................................
1.2.4.5.2.9.
Description of principles of adjustment through idle adjustment points: ...............................
1.2.4.5.2.10.
Other adjustment possibilities: if so and which (description and drawings):
1.2.4.5.2.11.
Working pressure(s):
................................................................................................... kPa
1.2.4.5.2.12.
Material: ................................................................................................................................
1.2.4.5.2.13.
Operating temperatures:
............................................................................................... °C
1.2.4.5.3.
CNG Gas/air mixer: yes/no
1.2.4.5.3.1.
Number: ...............................................................................................................................
1.2.4.5.3.2.
Make(s): ................................................................................................................................
1.2.4.5.3.3.
Type(s): .................................................................................................................................
1.2.4.5.3.4.
Drawings: ..............................................................................................................................
1.2.4.5.3.5.
Adjustment possibilities:........................................................................................................
1.2.4.5.3.6.
Working pressure(s):
.................................................................................................... kPa
1.2.4.5.3.7.
Material: ................................................................................................................................
1.2.4.5.3.8.
Operating temperatures:
............................................................................................... °C

1.2.4.5.7.
CNG container(s) or cylinder(s): yes/no
LNG tank(s) or vessel(s): yes/no
1.2.4.5.7.1.
Make(s): ................................................................................................................................
1.2.4.5.7.2.
Type(s) (include drawings):...................................................................................................
1.2.4.5.7.3.
Capacity: ....................................................................................................................... litres
1.2.4.5.7.4.
Drawings of the installation of the container/tank: ................................................................
1.2.4.5.7.5.
Dimensions: ..........................................................................................................................
1.2.4.5.7.6.
Material: ................................................................................................................................
1.2.4.5.8.
CNG container/LNG tank accessories
1.2.4.5.8.1.
Pressure indicator: yes/no
1.2.4.5.8.1.1.
Make(s): ................................................................................................................................
1.2.4.5.8.1.2.
Type(s): .................................................................................................................................
1.2.4.5.8.1.3.
Operating principle: float/other
(include description or drawings) ......................................
1.2.4.5.8.1.4.
Working pressure(s):
................................................................................................... MPa
1.2.4.5.8.1.5.
Material: ................................................................................................................................
1.2.4.5.8.1.6.
Operating temperatures:
............................................................................................... °C
1.2.4.5.8.2.
Pressure relief valve (discharge valve): yes/no
1.2.4.5.8.2.1.
Make(s): ................................................................................................................................
1.2.4.5.8.2.2.
Type(s): .................................................................................................................................
1.2.4.5.8.2.3.
Working pressure(s)
:................................................................................................... MPa
1.2.4.5.8.2.4.
Material: ................................................................................................................................
1.2.4.5.8.2.5.
Operating temperatures:
............................................................................................... °C
1.2.4.5.8.3.
Automatic cylinder valve
1.2.4.5.8.3.1.
Make(s): ................................................................................................................................
1.2.4.5.8.3.2.
Type(s): .................................................................................................................................

1.2.4.5.9.3.
Description and drawings: ....................................................................................................
1.2.4.5.9.4.
Activation temperature:
................................................................................................. °C
1.2.4.5.9.5.
Material: ................................................................................................................................
1.2.4.5.9.6.
Operating temperatures:
............................................................................................... °C
1.2.4.5.10.
Filling unit or receptacle: yes/no
1.2.4.5.10.1.
Make(s): ................................................................................................................................
1.2.4.5.10.2.
Type(s): .................................................................................................................................
1.2.4.5.10.3.
Working pressure(s)
:................................................................................................... MPa
1.2.4.5.10.4.
Description and drawings: ....................................................................................................
1.2.4.5.10.5.
Material: ................................................................................................................................
1.2.4.5.10.6.
Operating temperatures:
............................................................................................... °C
1.2.4.5.11.
Flexible fuel lines: yes/no
1.2.4.5.11.1.
Make(s): ................................................................................................................................
1.2.4.5.11.2.
Type(s): .................................................................................................................................
1.2.4.5.11.3.
Description: ...........................................................................................................................
1.2.4.5.11.4.
Working pressure(s):
................................................................................................... kPa
1.2.4.5.11.5.
Material: ................................................................................................................................
1.2.4.5.11.6.
Operating temperatures:
............................................................................................... °C
1.2.4.5.12.
Pressure and Temperature sensor(s): yes/no
1.2.4.5.12.1.
Make(s): ................................................................................................................................
1.2.4.5.12.2.
Type(s): .................................................................................................................................
1.2.4.5.12.3.
Description: ...........................................................................................................................
1.2.4.5.12.4.
Working pressure(s):
................................................................................................... kPa
1.2.4.5.12.5.
Material: ................................................................................................................................
1.2.4.5.12.6.
Operating temperatures:
............................................................................................... °C

1.2.4.5.17.
Fuel rail: yes/no
1.2.4.5.17.1.
Make(s): ................................................................................................................................
1.2.4.5.17.2.
Type(s): ................................................................................................................................ .
1.2.4.5.17.3.
Description: ...........................................................................................................................
1.2.4.5.17.4.
Working pressure
:........................................................................................................ kPa
1.2.4.5.17.5.
Material: ............................................................................................................................... .
1.2.4.5.17.6.
Operating temperatures:
............................................................................................. ..°C
1.2.4.5.18.
Heat Exchanger/Vaporizer: yes/no
....................................................................................
1.2.4.5.18.1.
Make(s): .................................................................................................................................
1.2.4.5.18.2.
Drawings: ...............................................................................................................................
1.2.4.5.18.3.
Working pressure(s):
.................................................................................................. MPa
1.2.4.5.18.4.
Material: .................................................................................................................................
1.2.4.5.18.5.
Operating temperatures:
................................................................................................ °C
1.2.4.5.19.
Natural gas detector: yes/no
1.2.4.5.19.1.
Make(s): ................................................................................................................................
1.2.4.5.19.2.
Type(s): .................................................................................................................................
1.2.4.5.19.3.
Drawings: ...............................................................................................................................
1.2.4.5.19.4.
Working pressure(s):
................................................................................................... MPa
1.2.4.5.19.5.
Material: .................................................................................................................................
1.2.4.5.19.6.
Operating temperatures:
................................................................................................ °C
1.2.4.5.19.7.
Set Values .............................................................................................................................
1.2.4.5.20.
LNG filling receptacle(s): yes/no
1.2.4.5.20.1.
Make(s): .................................................................................................................................
1.2.4.5.20.2.
Type(s): ..................................................................................................................................
1.2.4.5.20.3.
Description: ............................................................................................................................
1.2.4.5.20.4.
Working pressure(s):
................................................................................................... kPa

1.2.4.5.25.
LNG non-return valve(s): yes/no
1.2.4.5.25.1.
Make(s): .................................................................................................................................
1.2.4.5.25.2.
Type(s): ..................................................................................................................................
1.2.4.5.25.3.
Description: ............................................................................................................................
1.2.4.5.25.4.
Working pressure(s)
.................................................................................................... kPa
1.2.4.5.25.5.
Material: .................................................................................................................................
1.2.4.5.26.
LNG pressure relief valve(s): yes/no
1.2.4.5.26.1.
Make(s): .................................................................................................................................
1.2.4.5.26.2.
Type(s): ..................................................................................................................................
1.2.4.5.26.3.
Description: ...........................................................................................................................
1.2.4.5.26.4.
Working pressure(s):
.................................................................................................... kPa
1.2.4.5.26.5.
Material: .................................................................................................................................
1.2.4.5.27.
LNG excess flow valve(s): yes/no
1.2.4.5.27.1.
Make(s): .................................................................................................................................
1.2.4.5.27.2.
Type(s): .................................................................................................................................
1.2.4.5.27.3.
Description: ............................................................................................................................
1.2.4.5.27.4.
Working pressure(s):
.................................................................................................... kPa
1.2.4.5.27.5.
Material: .................................................................................................................................
1.2.4.5.28.
LNG fuel pump(s): yes/no
1.2.4.5.28.1.
Make(s): .................................................................................................................................
1.2.4.5.28.2.
Type(s): ..................................................................................................................................
1.2.4.5.28.3.
Description: ............................................................................................................................
1.2.4.5.28.4.
Working pressure(s):
.................................................................................................... kPa
1.2.4.5.28.5.
Location inside/outside LNG tank
: ......................................................................................
1.2.4.5.28.6.
Operating temperatures:
................................................................................................ °C
1.2.5.
Cooling system: (liquid/air)
1.2.5.1.
System description/ drawings with regard to the CNG/LNG system:

1.2.4.5.3.5.
Material: ................................................................................................................................
1.2.4.5.3.6.
Operating temperatures:
............................................................................................... °C
1.2.4.5.4.
Gas flow adjuster: yes/no
1.2.4.5.4.1.
Number: ................................................................................................................................
1.2.4.5.4.2.
Make(s): ................................................................................................................................
1.2.4.5.4.3.
Type(s): .................................................................................................................................
1.2.4.5.4.4.
Working pressure(s):
.................................................................................................... kPa
1.2.4.5.4.5.
Material: ................................................................................................................................
1.2.4.5.4.6.
Operating temperatures:
............................................................................................... °C
1.2.4.5.5.
Gas injector(s): yes/no
1.2.4.5.5.1.
Make(s): ................................................................................................................................
1.2.4.5.5.2.
Type(s): .................................................................................................................................
1.2.4.5.5.3.
Working pressure(s):
.................................................................................................... kPa
1.2.4.5.5.4.
Material: ................................................................................................................................
1.2.4.5.5.5.
Operating temperatures:
............................................................................................... °C
1.2.4.5.6.
Electronic Control Unit: yes/no
1.2.4.5.6.1.
Make(s): ................................................................................................................................
1.2.4.5.6.2.
Type(s): .................................................................................................................................
1.2.4.5.6.3.
Basic software principles: .....................................................................................................
1.2.4.5.6.4.
Operating temperatures:
............................................................................................... °C
1.2.4.5.7.
CNG container(s) or cylinder(s): yes/no
LNG tank(s) or vessel(s): yes/no
1.2.4.5.7.1.
Make(s): ................................................................................................................................
1.2.4.5.7.2.
Type(s): .................................................................................................................................
1.2.4.5.7.3.
Capacity: ....................................................................................................................... litres
1.2.4.5.7.4.
Approval number: ..................................................................................................................

1.2.4.5.8.4.4.
Material: ................................................................................................................................
1.2.4.5.8.4.5.
Operating temperatures:
............................................................................................... °C
1.2.4.5.8.5.
Gas-tight housing: yes/no
1.2.4.5.8.5.1
Make(s): ................................................................................................................................
1.2.4.5.8.5.2
Type(s): .................................................................................................................................
1.2.4.5.8.5.3.
Working pressure(s)
:................................................................................................... MPa
1.2.4.5.8.5.4.
Material: ................................................................................................................................
1.2.4.5.8.5.5.
Operating temperatures:
............................................................................................... °C
1.2.4.5.8.6.
Manual valve:
1.2.4.5.8.6.1
Make(s): ................................................................................................................................
1.2.4.5.8.6.2
Type(s): .................................................................................................................................
1.2.4.5.8.6.3
Working pressure(s)
.................................................................................................... MPa
1.2.4.5.8.6.4.
Material: ................................................................................................................................
1.2.4.5.8.6.5.
Operating temperatures:
............................................................................................... °C
1.2.4.5.9.
Pressure relief device (temperature triggered): yes/no
1.2.4.5.9.1.
Make(s): ................................................................................................................................
1.2.4.5.9.2.
Type(s): .................................................................................................................................
1.2.4.5.9.3.
Activation temperature:
................................................................................................. °C
1.2.4.5.9.4.
Material: ................................................................................................................................
1.2.4.5.9.5.
Operating temperatures:
............................................................................................... °C
1.2.4.5.10.
Filling unit or receptacle: yes/no
1.2.4.5.10.1.
Make(s): ................................................................................................................................
1.2.4.5.10.2.
Type(s): .................................................................................................................................
1.2.4.5.10.3.
Working pressure(s)
: .................................................................................................. MPa

1.2.4.5.14.4.
Material: ................................................................................................................................
1.2.4.5.14.5.
Operating temperatures:
............................................................................................... °C
1.2.4.5.15.
Connection to CNG/LNG system for heating system : yes/no
1.2.4.5.15.1.
Make(s): ................................................................................................................................
1.2.4.5.15.2.
Type(s): .................................................................................................................................
1.2.4.5.15.3.
Description and drawings of installation: ..............................................................................
1.2.4.5.16.
PRD (pressure triggered): yes/no
1.2.4.5.16.1.
Make(s): ...............................................................................................................................
1.2.4.5.16.2.
Type(s): ................................................................................................................................
1.2.4.5.16.3.
Activation pressure:
................................................................................................... MPa
1.2.4.5.16.4.
Material: ...............................................................................................................................
1.2.4.5.16.5.
Operating temperatures:
............................................................................................... °C
1.2.4.5.17.
Fuel rail: yes/no
1.2.4.5.17.1.
Make(s): ................................................................................................................................
1.2.4.5.17.2.
Type(s): ................................................................................................................................ .
1.2.4.5.17.3.
Working pressure
:........................................................................................................ kPa
1.2.4.5.17.4.
Material: ............................................................................................................................... .
1.2.4.5.17.5.
Operating temperatures
: .............................................................................................. ..°C
1.2.4.5.18.
Heat exchanger/Vaporizer Heat Exchanger/Vaporizer: yes/no
: ...................................... ..
1.2.4.5.18.1.
Make(s) .................................................................................................................................
1.2.4.5.18.2.
Type(s): ................................................................................................................................ .
1.2.4.5.18.3.
Drawings ...............................................................................................................................
1.2.4.5.18.4.
Working pressure
:..............................................................................................................
1.2.4.5.18.5.
Material: ................................................................................................................................
1.2.4.5.18.6.
Operating temperatures:
................................................................................................. °C
1.2.4.5.19.
Natural gas detector: yes/no

1.2.4.5.23.1.
Make(s): .................................................................................................................................
1.2.4.5.23.2.
Type(s): ..................................................................................................................................
1.2.4.5.23.3.
Description: ............................................................................................................................
1.2.4.5.23.4.
Working pressure(s):
.................................................................................................... kPa
1.2.4.5.23.5.
Material: .................................................................................................................................
1.2.4.5.24.
LNG Automatic valve(s): yes/no
1.2.4.5.24.1.
Make(s): .................................................................................................................................
1.2.4.5.24.2.
Type(s): ..................................................................................................................................
1.2.4.5.24.3.
Description: ............................................................................................................................
1.2.4.5.24.4.
Working pressure(s):
................................................................................................... kPa
1.2.4.5.24.5.
Material: .................................................................................................................................
1.2.4.5.25.
LNG non-return valve(s): yes/no
1.2.4.5.25.1.
Make(s): .................................................................................................................................
1.2.4.5.25.2.
Type(s): ..................................................................................................................................
1.2.4.5.25.3.
Description: ............................................................................................................................
1.2.4.5.25.4.
Working pressure(s):
.................................................................................................... kPa
1.2.4.5.25.5.
Material: .................................................................................................................................
1.2.4.5.26.
LNG pressure relief valve(s): yes/no
1.2.4.5.26.1.
Make(s): .................................................................................................................................
1.2.4.5.26.2.
Type(s): ..................................................................................................................................
1.2.4.5.26.3.
Description: ............................................................................................................................
1.2.4.5.26.4.
Working pressure(s):
.................................................................................................... kPa
1.2.4.5.26.5.
Material: .................................................................................................................................
1.2.4.5.27.
LNG excess flow valve(s): yes/no
1.2.4.5.27.1.
Make(s): .................................................................................................................................

ANNEX 2A
ARRANGEMENT OF THE CNG/LNG COMPONENT TYPE-APPROVAL MARK
(See Paragraph 7.2. of this Regulation)
a ≥8mm
The above approval mark affixed to the CNG and or LNG component shows that this component has
been approved in Italy (E3), pursuant to Regulation No. 110 under approval number 012439. The first
two digits of the approval number indicate that the approval was granted in accordance with the
requirements of Regulation No. 110 as amended by the 01 series of amendments.
The letter "L" indicates that the product is suitable for use with LNG.
The letter "M" indicates that the product is suitable in moderate temperatures.
The letter "C" indicates that the product is suitable in cold temperatures.

Natural gas detector(s)
LNG filling receptacle(s)
LNG pressure control regulator(s)
LNG pressure and/or temperature sensor(s)
LNG manual valve(s)
LNG automatic valve(s)
LNG non-return valve(s)
LNG pressure relief valve(s)
LNG excess flow valve(s)
LNG fuel pump(s)
2. Trade name or mark: ............................................................................................................................
3. Manufacturer's name and address: ......................................................................................................
4. If applicable, name and address of manufacturer's representative: ....................................................
5. Submitted for approval on: ...................................................................................................................
6. Technical Service responsible for conducting approval tests: .............................................................
7. Date of report issued by that Service: ..................................................................................................
8. No. of report issued by that Service: ....................................................................................................
9. Approval granted/refused/extended/withdrawn
10. Reason(s) of extension (if applicable): .................................................................................................
11. Place: ....................................................................................................................................................
12. Date: .....................................................................................................................................................
13. Signature: .............................................................................................................................................
14. The documents filed with the application or extension of approval can be obtained upon request.

1.7.
Pressure Regulator(s)
1.7.1.
Working pressure(s):
...................................................................................................................
1.7.2.
Material: ...........................................................................................................................................
1.8.
Non-Return Valve(s)
1.8.1.
Working pressure(s):
...................................................................................................................
1.8.2.
Material: ...........................................................................................................................................
1.9.
Pressure Relief Device (Temperature Triggered)
1.9.1.
Working pressure(s):
....................................................................................................................
1.9.2.
Material: ...........................................................................................................................................
1.10.
Manual Valve
1.10.1.
Working pressure(s):
....................................................................................................................
1.10.2.
Material: ...........................................................................................................................................
1.11.
Flexible Fuel Lines
1.11.1.
Working pressure(s):
....................................................................................................................
1.11.2.
Material: ...........................................................................................................................................
1.12.
Filling Unit or Receptacle
1.12.1.
Working pressure(s):
....................................................................................................................
1.12.2.
Material: ...........................................................................................................................................
1.13.
Gas Injector(s)
1.13.1.
Working pressure(s):
...................................................................................................................
1.13.2.
Material: ...........................................................................................................................................
1.14.
Gas Flow Adjuster
1.14.1.
Working pressure(s):
...................................................................................................................
1.14.2.
Material: ...........................................................................................................................................
1.15.
Gas/Air Mixer
1.15.1.
Working pressure(s):
....................................................................................................................

1.24.2.
Material: .................................................................................................................................... MPa
1.25.
LNG Pressure and/or Temperature Sensor(s)
1.25.1.
Working pressure(s):
............................................................................................................. MPa
1.25.2.
Material: .................................................................................................................................... MPa
1.26.
LNG Manual Valve(s)
1.26.1.
Working pressure(s):
............................................................................................................. MPa
1.26.2.
Material: .................................................................................................................................... MPa
1.27.
LNG Automatic Valve(s)
1.27.1.
Working pressure(s):
............................................................................................................. MPa
1.27.2.
Material: .................................................................................................................................... MPa
1.28.
LNG Non-Return Valve(s)
1.28.1.
Working pressure(s):
............................................................................................................. MPa
1.28.2.
Material: .................................................................................................................................... MPa
1.29.
LNG Pressure Relief Valve(s)
1.29.1.
Working pressure(s):
............................................................................................................. MPa
1.29.2.
Material: .................................................................................................................................... MPa
1.30.
LNG Excess Flow Valve(s)
1.30.1.
Working pressure(s):
............................................................................................................. MPa
1.30.2.
Material: .................................................................................................................................... MPa
1.31.
LNG Fuel Pump(s)
1.31.1.
Working pressure(s):
............................................................................................................. MPa
1.31.2.
Material: .................................................................................................................................... MPa

ANNEX 2D
COMMUNICATION
(maximum format: A4 (210 x 297mm))
issued by:
Name of administration:
.............................................
.............................................
.............................................
concerning:
APPROVAL GRANTED
APPROVAL EXTENDED
APPROVAL REFUSED
APPROVAL WITHDRAWN
PRODUCTION DEFINITIVELY DISCONTINUED
of a vehicle type with regard to the installation of CNG/LNG system pursuant to Regulation No. 110
Approval No.: ...................................................... Extension No.: .........................................................
1. Trade name or mark of vehicle: ......................................................................................................
2. Vehicle type: ....................................................................................................................................
3. Vehicle category: .............................................................................................................................
4. Manufacturer's name and address: .................................................................................................
5. If applicable, name and address of manufacturer's representative: ...............................................
6. Description of the vehicle, drawings, etc. (needs detailing): ...........................................................
7. Test results: .....................................................................................................................................
8. Vehicle submitted for approval on: ..................................................................................................
9. Technical Service responsible for conducting approval tests: ........................................................
10. Date of report issued by that Service: .............................................................................................
11. CNG/LNG system
11.1. Trade name or mark of components and their approval numbers: .................................................
11.1.1. Container(s) or cylinder(s): ..............................................................................................................

ANNEX 3
ON-BOARD STORAGE OF NATURAL GAS AS A FUEL FOR AUTOMOTIVE VEHICLES
1. SCOPE
1.1. Annex 3A sets out minimum requirements for light-weight refillable gas cylinders. The cylinders
are intended only for the on-board storage of high pressure compressed natural gas as a fuel
for automotive vehicles to which the cylinders are to be fixed. Cylinders may be of any steel,
aluminium or non-metallic material, design or method of manufacture suitable for the specified
service conditions. This Annex also covers stainless steel metal liners of seamless or welded
construction.
1.2. Annex 3B sets out minimum requirements for refillable fuel tanks for liquefied natural gas
(LNG) used in vehicles as well as the testing methods required.

4.1.2. Use of Cylinders
The service conditions specified are also intended to provide information on how cylinders
made to this Regulation may safely be used to:
(a)
(b)
(c)
(d)
(e)
(f)
manufacturers of cylinders;
owners of cylinders;
designers or contractors responsible for the installation of cylinders;
designers or owners of equipment used to refuel vehicle cylinders;
suppliers of natural gas; and
regulatory authorities who have jurisdiction over cylinder use.
4.1.3. Service Life
The service life for which cylinders are safe shall be specified by the cylinder designer on the
basis of use under service conditions specified herein. The maximum service life shall be
20 years.
4.1.4. Periodic Re-qualification
Recommendations for periodic re-qualification by visual inspection or testing during the service
life shall be provided by the cylinder manufacturer on the basis of use under service conditions
specified herein. Each cylinder shall be visually inspected at least every 48 months after the
date of its entry into service on the vehicle (vehicle registration), and at the time of any
re-installation, for external damage and deterioration, including under the support straps. The
visual inspection shall be performed by a competent agency approved or recognised by the
Regulatory Authority, in accordance with the manufacturers specifications: Cylinders without
label containing mandatory information, or with labels containing mandatory information that
are illegible in any way shall be removed from service. If the cylinder can be positively identified
by manufacturer and serial number, a replacement label may be applied, allowing the cylinder
to remain in service.
4.1.4.1. Cylinders involved in collisions
Cylinders which have been involved in a vehicle collision shall be re-inspected by an agency
authorised by the manufacturer, unless otherwise directed by the Authority having jurisdiction.
A cylinder that have not experienced any impact damage from the collision may be returned to
service, otherwise the cylinder shall be returned to the manufacturer for evaluation.
4.1.4.2 Cylinders involved in fires
Cylinders which have been subject to the action of fire shall be re-inspected by an agency
authorised by the manufacturer, or condemned and removed from service.

Hydrogen shall be limited to 2% by volume when cylinders are manufactured from a
steel with an ultimate tensile strength exceeding 950MPa;
(c)
Wet gas
Gas that contains a water content higher than b) normally meets the following constituent
limits;
Hydrogen sulphide and other soluble sulphides:
Oxygen:
Carbon dioxide:
Hydrogen:
23mg/m
1% by volume
4% by volume
0.1% by volume
4.6. External Surfaces
Under wet gas conditions, a minimum of 1mg of compressor oil per kg of gas is
necessary to protect metallic cylinders and liners.
Cylinders are not designed for continuous exposure to mechanical or chemical attack.
e.g. leakage from cargo that may be carried on vehicles or severe abrasion damage from road
conditions, and shall comply with recognised installation standards. However, cylinder external
surfaces may be inadvertently exposed to:
(a)
(b)
(c)
(d)
(e)
(f)
water, either by intermittent immersion or road spray;
salt, due to the operation of the vehicle near the ocean or where ice melting salt is used;
ultra-violet radiation from sunlight;
impact of gravel;
solvents, acids and alkalis, fertilisers; and
automotive fluids, including gasoline, hydraulic fluids, glycol and oils.
4.7. Gas Permeation or Leakage
Cylinders may be located in enclosed spaces for extended periods of time. Permeation of gas
through the cylinder wall or leakage between the end connections and the liner shall be
considered in the design.

5.3. Design Data
5.3.1. Drawings
Drawings shall show the following as a minimum:
(a)
(b)
(c)
(d)
(e)
(f)
Title, reference number, date of issue, and revision numbers with dates of issue if
applicable;
Reference to this Regulation and the cylinder type;
All dimensions complete with tolerances, including details of end closure shapes with
minimum thicknesses and of openings;
Mass, complete with tolerance, of cylinders;
Material specifications, complete with minimum mechanical and chemical properties or
tolerance ranges and, for metal cylinders or metal liners, the specified hardness range;
Other data such as, auto-frettage pressure range, minimum test pressure, details of the
fire protection system and of the exterior protective coating.
5.3.2. Stress Analysis Report
A finite element stress analysis or other stress analysis shall be provided;
A table summarising the calculated stresses in the report shall be provided.
5.3.3. Material Test Data
A detailed description of the materials and tolerances of the materials properties used in the
design shall be provided. Test data shall also be presented characterising the mechanical
properties and the suitability of the materials for service under the conditions specified in
Paragraph 4. above.
5.3.4. Design Qualification Test Data
The cylinder material, design, manufacture and examination shall be provided to be adequate
for their intended service by meeting the requirements of the tests required for the particular
cylinder design, when tested in accordance with the relevant methods of test detailed in
Appendix A to this annex.
The test data shall also document the dimensions, wall thicknesses and weights of each of the
test cylinders.
5.3.5. Fire Protection
The arrangement of pressure relief devices that will protect the cylinder from sudden rupture
when exposed to the fire conditions in Paragraph A.15 shall be specified. Test data shall
substantiate the effectiveness of the specified fire protection system.

5.9. Approval and Certification
5.9.1. Inspection and Testing
Evaluation of conformity is required to be performed in accordance with the provisions of
Paragraph 9 of this Regulation;
In order to ensure that the cylinders are in compliance with this international Regulation they
shall be subject to inspection in accordance with Paragraphs 6.13. and 6.14. below performed
by the Type Approval Authority.
5.9.2. Test Certificate
If the results of prototype testing according to Paragraph 6.13. are satisfactory, the Type
Approval Authority shall issue a test certificate. An example of a test certificate is given in
Appendix D to this Annex.
5.9.3. Batch Acceptance Certificate
The Type Approval Authority shall prepare an acceptance certificate as provided in Appendix D
to this Annex.
6. REQUIREMENTS APPLICABLE TO ALL CYLINDER TYPES
6.1. General
6.2. Design
The following requirements are generally applicable to the cylinder types specified in
Paragraphs 7 to 10. of this Annex. The design of cylinders shall cover all relevant aspects
which are necessary to ensure that every cylinder produced according to the design is fit for its
purpose for the specified service life; Type CNG-1 steel cylinders designed in accordance with
ISO 9809 and meeting all the requirements therein are only required to meet the requirements
of Paragraphs 6.3.2.4. and 6.9 to 6.13. below.
This Regulation does not provide design formulas nor permissible stresses or strains, but
requires the adequacy of the design to be established by appropriate calculations and
demonstrated by cylinders being capable of consistently passing the materials, design
qualification, production and batch tests specified in this Regulation; All designs shall ensure a
"leakage before break" failure mode under feasible degradation of pressure parts during normal
service. If leakage of metal cylinders or metal liners occurs, it shall be only by the growth of a
fatigue crack.

6.3.2.6. Sulphide stress cracking resistance
If the upper limit of the specified tensile strength for the steel exceeds 950MPa, the steel from a
finished cylinder shall be subjected to a sulphide stress cracking resistance test in accordance
with Appendix A to this Annex, Paragraph A.3. and meet the requirements listed therein.
6.3.3. Aluminium
6.3.3.1. Composition
Aluminium alloys shall be quoted in line with Aluminium Association practice for a given alloy
system. The impurity limits for lead and bismuth in any aluminium alloy shall not exceed
0.003%;
6.3.3.2. Corrosion tests
Aluminium alloys shall meet the requirements of the corrosion tests carried out in accordance
with Paragraph A.4 (Appendix A to this Annex);
6.3.3.3. Sustained load cracking
Aluminium alloys shall meet the requirements of the sustained load cracking tests carried out in
accordance with Paragraph A.5 (Appendix A to this Annex);
6.3.3.4. Tensile properties
6.3.4. Resins
6.3.4.1. General
The mechanical properties of the aluminium alloy in the finished cylinder shall be determined in
accordance with Paragraph A.1 (Appendix A to this Annex). The elongation for aluminium shall
be at least 12%.
The material for impregnation may be thermosetting or thermoplastic resins. Examples of
suitable matrix materials are epoxy, modified epoxy, polyester and vinylester thermosetting
plastics, and polyethylene and polyamide thermoplastic material;
6.3.4.2. Shear strength
Resin materials shall be tested in accordance with Paragraph A.26 (Appendix A to this Annex),
and meet the requirements therein;
6.3.4.3. Glass transition temperature
The glass transition temperature of the resin material shall be determined in accordance with
ASTM D3418.

(g)
When analysing cylinders with hybrid reinforcement (two or more different fibre types),
the load share between the different fibres shall be considered based on the different
elastic moduli of the fibres. The stress ratio requirements for each individual fibre type
shall be in accordance with the values given in Table 6.3 of this Annex. Verification of the
stress ratios may also be performed using strain gauges. An acceptable method is
outlined in the informative Appendix E to this Annex.
6.6. Stress Analysis
A stress analysis shall be performed to justify the minimum design wall thicknesses. It shall
include the determination of the stresses in liners and fibres of composite designs.
6.7. Leak-Before-Break (LBB) Assessment
Types CNG-1, CNG-2 and CNG-3 cylinders shall demonstrate Leak-Before-Break (LBB)
performance. The LBB performance test shall be carried out in accordance with Paragraph A.6
(Appendix to this Annex). Demonstration of LBB performance is not required for cylinder
designs that provide a fatigue life exceeding 45,000 pressure cycles when tested in accordance
with Paragraph A.13 (Appendix A to this Annex). Two methods of LBB assessment are
included for information in Appendix F to this annex.
6.8. Inspection and Testing
The manufacturing inspection shall specify programmes and procedures for:
(a)
(b)
manufacturing inspection, tests and acceptance criteria; and
periodic in service inspection, tests and acceptance criteria. The interval of visual
re-inspection of the external cylinder surfaces shall be in accordance with
Paragraph 4.1.4. of this Annex unless varied by the Type Approval Authority. The
manufacturer shall establish the visual re-inspection rejection criteria based on the
results of pressure cycling tests performed on cylinders containing flaws. A guide for
manufacturer's instructions for handling, use and inspection is provided in Appendix G to
this Annex.
6.9. Fire Protection
All cylinders shall be protected from fire with pressure relief devices. The cylinder, its materials,
pressure relief devices and any added insulation or protective material shall be designed
collectively to ensure adequate safety during fire conditions in the test specified in Paragraph
A.15 (Appendix A to this Annex).
Pressure relief devices shall be tested in accordance with Paragraph A.24 (Appendix A to this
Annex).
6.10. Openings
6.10.1. General
Openings are permitted in heads only. Centre line of openings shall coincide with the
longitudinal axis of the cylinder. Threads shall be clean cut, even, without surface
discontinuities, and to gauge.

6.15. Production Examinations and Tests
6.15.1. General
Production examinations and tests shall be carried out on all cylinders produced in a batch.
Each cylinder shall be examined during manufacture and after completion by the following
means:
(a)
(b)
(c)
(d)
ultrasonic scanning (or demonstrated equivalent) of metallic cylinders and liners in
accordance with BS 5045, Part 1, Annex B, or demonstrated equivalent method, to
confirm that the maximum defect size present is smaller than the size specified in the
design;
verification that the critical dimensions and mass of the completed cylinder and of any
liner and over-wrapping are within design tolerances;
verification of compliance with specified surface finish with special attention to deep
drawn surfaces and folds or laps in the neck or shoulder of forged or spun end
enclosures or openings;
verification of markings;
(e) hardness tests of metallic cylinders and liners in accordance with Paragraph A.8
(Appendix A to this Annex) shall be carried out after the final heat treatment and the
values thus determined shall be in the range specified for the design;
(f)
hydrostatic proof test in accordance with Paragraph A.11 (Appendix A to this Annex);
A summary of critical production inspection requirements to be performed on every cylinder is
provided in Table 6.6 of this Annex;
6.15.2. Maximum Defect Size
For Type CNG-1, CNG-2 and CNG-3 designs, the maximum defect size at any location in the
metal cylinder or metal liner that will not grow to a critical size within the specified service life
shall be determined. The critical defect size is defined as the limiting through-wall (cylinder or
liner) thickness defect that would allow stored gas to be discharged without rupturing the
cylinder. Defect sizes for the rejection criteria for ultrasonic scanning, or equivalent shall be
smaller than the maximum allowable defect sizes. For Type CNG-2 and CNG-3 designs
assume that there shall be no damage to composite due to any time-dependent mechanisms;
The allowable defect size for NDE shall be determined by an appropriate method. Two such
methods are outlined in the informative Appendix F to this Annex.

Table 6.2
Impact Test Acceptable Values
Cylinder diameter D, (mm)
>140
≤140
Direction of testing
transverse
longitudinal
Width of test piece, (mm)
3 − 5
>5 − 7.5
>7.5 − 10
3 to 5
Test temperature, (°C)
−50
−50
Impact strength, (J/cm )
Mean of 3 specimens
Individual specimen
30
24
35
28
40
32
60
48
Table 6.3
CNG−1
All-metal
Burst
pressure
[MPa]
All metal 45
Minimum Actual Burst Values and Stress Ratios
CNG−2
Hoop-wrapped
Stress
ratio
[MPa]
Burst
pressure
[MPa]
CNG−3
Fully-wrapped
Stress
ratio
[MPa]
Burst
pressure
[MPa]
CNG−4
All-composite
Stress
ratio
[MPa]
Burst
pressure
[MPa]
Glass 2.75 50 3.65 70 3.65 73
Aramid 2.35 47 3.10 60 3.1 62
Carbon 2.35 47 2.35 47 2.35 47
Hybrid
Note - Minimum actual burst pressure. In addition, calculations shall be performed in accordance
with Paragraph 6.5. of this Annex to confirm that the minimum stress ratio requirements are
also met.
Note - Stress ratios and burst pressures shall be calculated in accordance with Paragraph 6.5. of
this Annex.

Table 6.6
Critical Production Inspection Requirements
Type
Cylinder type
Inspection requirements CNG−1 CNG−2 CNG−3 CNG−4
Critical dimensions
Surface finish
Flaws (ultrasonic or equivalent)
Hardness of metal cylinders and metal liners
Hydrostatic proof test
Leak test
Markings
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X = required
Table 6.7
Change of Design

7.4. Cylinder Batch Tests
Batch testing shall be conducted on finished cylinders which are representative of normal
production and are complete with identification marks. Two cylinders shall be randomly
selected from each batch. If more cylinders are subjected to the tests than are required by this
annex, all results shall be documented. The following tests shall as a minimum be carried out
on these.
(a)
Batch materials tests. One cylinder, or a heat treat witness sample representative of a
finished cylinder, shall be subjected to the following tests:
(i)
(ii)
Critical dimensions checked against the design;
One tensile test in accordance with Paragraph A.1 (Appendix A to this Annex) and
meet the requirements of the design;
(iii) For steel cylinders, three impact tests in accordance with Paragraph A.2.
(Appendix A to this Annex) and meet the requirements of Paragraph 6.3.2.3.
above;
(iv)
When a protective coating is a part of the design, the coating shall be tested in
accordance with Paragraph A.9.2 (Appendix A to this Annex);
All cylinders represented by a batch test which fail to meet the specified
requirements shall follow the procedures specified in Paragraph 6.16. above.
Where the coating fails to meet the requirements of Paragraph A.9.2. (Appendix A
to this Annex), the batch shall be 100% inspected to remove similarly defective
cylinders. The coating on all defective cylinders may be stripped and recoated.
The coating batch test shall then be repeated;
(b)
Batch burst test. One cylinder shall be hydrostatically pressurised to burst in accordance
with Paragraph A.12 (Appendix A to this Annex).
If the burst pressure is less than the minimum calculated burst pressure the procedures
specified in Paragraph 6.16. above shall be followed.
(c)
Periodic pressure cycling test. Finished cylinders shall be pressure cycled in accordance
with Paragraph A.13 (Appendix A to this Annex) at a test frequency defined as follows:
(i)
(ii)
(iii)
one cylinder from each batch shall be pressure cycled for a total of 1,000 times the
specified service life in years, with a minimum 15,000 cycles;
on 10 sequential production batches of a design family (i.e. similar materials and
processes), should none of the pressure cycled cylinders in (i) above leak or
rupture in less than 1,500 cycles times the specified life in years (minimum
22,500 cycles) then the pressure cycle test can be reduced to one cylinder from
every 5 batches of production;
on 10 sequential production batches of a design family, should none of the
pressure cycled cylinders in (i) above leak or rapture in less than 2,000 cycles
times the specified service life in years (minimum 30,000 cycles) then the pressure
cycle test can be reduced to one cylinder from every 10 batches of production;

7.5.5. Penetration Test
Test shall be conducted in accordance with Paragraph A.16 (Appendix A to this Annex) and
meet the requirements therein.
7.5.6. LBB Performance
For cylinder designs not exceeding 45,000 cycles when tested as per Paragraph 7.5.3. above,
LBB performance tests shall be conducted in accordance with A.6 of Appendix 1 to this Annex
and meet the requirements therein.
8. TYPE CNG-2 HOOP-WRAPPED CYLINDERS
8.1. General
During pressurisation, this type of cylinder design has a behaviour in which the displacements
of the composite over-wrap and the metal liner are linearly superimposed. Due to different
techniques of manufacture, this Annex does not give a definite method for design.
Determination of the leak-before-break (LBB) performance shall be in accordance with the
appropriate procedures defined in Paragraph A.6 (Appendix A to this Annex). Allowable defect
size shall be determined in accordance with Paragraph 6.15.2. above.
8.2. Design Requirements
8.2.1. Metal Liner
The metal liner shall have a minimum actual burst pressure of 26MPa.
8.2.2. Composite Over-wrap
The tensile stress in the fibres shall meet the requirements of Paragraph 6.5. above.
8.2.3. Stress Analysis
The stresses in the composite and in the liner after pre-stress shall be calculated. The
pressures used for these calculations shall be zero, 2MPa, 20MPa test pressure and design
burst pressure. The calculations shall use suitable analysis techniques using thin-shell theory
taking account of non-linear material behaviour of the liner to establish stress distributions at
the neck, transition regions and the cylindrical part of the liner.
For designs using auto-frettage to provide pre-stress, the limits within which the auto-frettage
pressure fall shall be calculated.
For designs using controlled tension winding to provide pre-stress, the temperature at which it
is performed, the tension required in each layer of composite and the consequent pre-stress in
the liner shall be calculated.

8.4. Production Test Requirements
8.4.1. Non-destructive Examination
Non-destructive examinations shall be carried out in accordance with a recognised ISO or an
equivalent standard. The following tests shall be carried out on each metallic liner:
(a)
(b)
Hardness test in accordance with Paragraph A.8 (Appendix A to this Annex);
Ultrasonic examination, in accordance with BS 5045, Part 1, Annex 1B, or demonstrated
equivalent NDT method, to ensure that the maximum defect size does not exceed the
size specified in the design.
8.4.2. Hydrostatic Pressure Testing
Each finished cylinder shall be hydrostatically pressure tested in accordance with
Paragraph A.11 (Appendix A to this Annex). The manufacturer shall define the appropriate limit
of permanent volumetric expansion for the test pressure used, but in no case shall the
permanent expansion exceed 5% of the total volumetric expansion at test pressure. Any
cylinders not meeting the defined rejection limit shall be rejected and either destroyed or used
for batch rest purposes.
8.5. Cylinder Batch Tests
8.5.1. General
Batch testing shall be conducted on finished cylinders which are representative of normal
production and are complete with identification marks. Two cylinders, or a cylinder and a liner
as appropriate, shall be randomly selected from each batch. If more cylinders are subjected to
the tests than are required by this Annex, all results shall be documented. The following tests
shall as a minimum be carried out on these.
Where defects are detected in over-wrapping before any auto-frettage or hydrostatic pressure
testing, the over-wrapping may be completely removed and replaced;
(a)
Batch materials tests. One cylinder, or liner, or heat treat witness sample that is
representative of a finished cylinder, shall be subjected to the following tests:
(i)
(ii)
(iii)
(iv)
Dimensions checked against the design;
One tensile test in accordance with Paragraph A.1 (Appendix A to this Annex) and
meet the requirements of the design;
For steel liners, three impact tests in accordance with Paragraph A.2 (Appendix A
to this Annex) and meet the requirements of the design;
When a protective coating is a part of the design, the coating shall be tested in
accordance with Paragraph A.9.2 (Appendix A to this Annex) and meet the
requirements therein. All cylinders or liners represented by a batch test which fails
to meet the requirements specified shall follow the procedures specified in
Paragraph 6.16. above.

8.6.6. Penetration test
One finished cylinder shall be tested in accordance with Paragraph A.16. (Appendix A to this
Annex) and meet the requirements therein.
8.6.7. Flaw Tolerance Tests
One finished cylinder shall be tested in accordance with Paragraph A.17. (Appendix A to this
Annex) and meet the requirements therein.
8.6.8. High Temperature Creep Test
In designs where the glass transition temperature of the resin does not exceed the maximum
design material temperature by at least 20°C, one cylinder shall be tested in accordance with
Paragraph A.18 (Appendix A to this Annex) and meet the requirements therein.
8.6.9. Accelerated Stress Rupture Test
One finished cylinder shall be tested in accordance with Paragraph A.19. (Appendix A to this
Annex) and meet the requirements therein.
8.6.10. LBB Performance
For cylinder designs not exceeding 45,000 cycles when tested as per Paragraph 8.6.3. above,
LBB performance tests shall be conducted in accordance with A.6. of Appendix A to this Annex
and meet the requirements therein.
8.6.11. Extreme Temperature Pressure Cycling Test
One finished cylinder shall be tested in accordance with Paragraph A.7. (Appendix A to this
Annex) and meet the requirements therein.
9. TYPE CNG-3 FULLY-WRAPPED CYLINDERS
9.1. General
During pressurisation, this type of cylinder has a behaviour in which the displacements of the
composite over-wrap and the liner are superimposed. Due to different techniques of
manufacture, this Annex does not give a definite method for design; Determination of the
leak-before-break (LBB) performance shall be in accordance with the appropriate procedures
defined in Paragraph A.6 (Appendix A to this Annex). Allowable defect size shall be determined
in accordance with Paragraph 6.15.2. above.
9.2. Design Requirements
9.2.1. Metal Liner
The compressive stress in the liner at zero pressure and 15°C shall not cause the liner to
buckle or crease.
9.2.2. Composite Over-wrap
The tensile stress in the fibres shall meet the requirements of Paragraph 6.5. above.

10.3. Stress Analysis
The stresses in the tangential and longitudinal direction of the cylinder in the composite and in
the liner shall be calculated. The pressures used for these calculations shall be zero, working
pressure, test pressure and design burst pressure. The calculations shall use suitable analysis
techniques to establish stress distribution throughout the cylinder.
10.4. Manufacturing Requirements
Manufacturing requirements shall be in accordance with Paragraph 8.3. above except that the
curing temperature for thermosetting resins shall be at least 10°C below the softening
temperature of the plastic liner.
10.5. Production Test Requirements
10.5.1. Hydrostatic Pressure Testing
Each finished cylinder shall be hydrostatically pressure tested in accordance with
Paragraph A.11. (Appendix A to this Annex). The manufacturer shall define the appropriate
limit of elastic expansion for the test pressure used, but in no case shall the elastic expansion
of any cylinder exceed the average batch value by more than 10%. Any cylinders not meeting
the defined rejection limit shall be rejected and either destroyed or used for batch test
purposes.
10.5.2. Leak Testing
Each finished cylinder shall be leak tested in accordance with Paragraph A.10. (Appendix A to
this Annex) and meet the requirements therein.
10.6. Cylinder Batch Tests
10.6.1. General
Batch testing shall be conducted on finished cylinders which are representative of normal
production and are complete with identification marks. One cylinder shall be randomly selected
from each batch. If more cylinders are subjected to the tests than are required by this Annex,
all results shall be documented. The following tests shall, as a minimum, be carried out on
these cylinders.
(a)
Batch materials test
One cylinder, or liner, or liner witness sample that is representative of a finished cylinder,
shall be subjected to the following tests:
(i)
(ii)
(iii)
Dimensions checked against the design;
One tensile test of the plastic liner in accordance with Paragraph A.22.
(Appendix A to this Annex) and meet the requirements of the design;
The melt temperature of the plastic liner shall be tested in accordance with
Paragraph A.23. (Appendix A to this Annex), and meet the requirements of the
design;

11. MARKING
11.1. Provision of Marking
On each cylinder the manufacturer shall provide clear permanent markings not less than 6mm
high. Marking shall be made either by labels incorporated into resin coatings, labels attached
by adhesive, low stress stamps used on the thickened ends of Type CNG-1 and CNG-2
designs, or any combination of the above. Adhesive labels and their application shall be in
accordance with ISO 7225, or an equivalent Standard. Multiple labels are allowed and should
be located such that they are not obscured by mounting brackets. Each cylinder complying with
this Annex shall be marked as follows:
(a)
Mandatory information:
(i)
(ii)
(iii)
(iv)
(v)
(vi)
"CNG ONLY";
"DO NOT USE AFTER XX/XXXX ", where XX/XXXX identifies the month and the
year of expiry ;
Manufacturers identification;
Cylinder identification (applicable part number and a serial number unique for
every cylinder);
Working pressure and temperature;
ECE Regulation number, along with cylinder type and certification registration
number;
(vii) The pressure relief devices and/or valves which are qualified for use with the
cylinder, or the means for obtaining information on qualified fire protection
systems;
(viii) When labels are used, all cylinders shall have a unique identification number
stamped on an exposed metal surface to permit tracing in the event that the label
is destroyed;

ANNEX 3A – APPENDIX A
TEST METHODS
A.1.
TENSILE TESTS, STEEL AND ALUMINIUM
A tensile test shall be carried out on the material taken from the cylindrical part of the finished
cylinder using a rectangular test piece shaped in accordance with the method described in
ISO 9809 for steel and ISO 7866 for aluminium. For cylinders with welded stainless steel liners,
tensile tests shall be also carried out on material taken from the welds in accordance with the
method described in Paragraph 8.4. of EN 13322-2. The two faces of the test piece
representing the inside and outside surface of the cylinder shall not be machined; The tensile
test shall be carried out in accordance with ISO 6892.
NOTE - Attention is drawn to the method of measurement of elongation described in ISO 6892,
particularly in cases where the tensile test piece is tapered, resulting in a point of fracture away
from the middle of the gauge length.
A.2.
IMPACT TEST, STEEL CYLINDERS AND STEEL LINERS
The impact test shall be carried out on the material taken from the cylindrical part of the
finished cylinder on three test pieces in accordance with ISO 148. The impact test pieces shall
be taken in the direction as required in Table 6.2 of Annex 3A from the wall of the cylinder. For
cylinders with welded stainless steel liners, impact tests shall be also carried out on material
taken from the weld in accordance with the method described in Paragraph 8.6. of EN 13322-2.
The notch shall be perpendicular to the face of the cylinder wall. For longitudinal tests the test
piece shall be machined all over (on six faces), if the wall thickness does not permit a final test
piece width of 10mm, the width shall be as near as practicable to the nominal thickness of the
cylinder wall. The test pieces taken in transverse direction shall be machined on four faces
only, the inner and outer face of the cylinder wall un-machined.
A.3.
SULPHIDE STRESS CRACKING TEST FOR STEEL
Except as identified in the following, testing shall be conducted in accordance with Method
A-NACE Standard Tensile Test procedures, as described in the NACE Standard TM0177-96.
Tests shall be conducted on a minimum of three tensile specimens with a gauge diameter
3.81mm (0.150in) machined from the wall of a finished cylinder or liner. The specimens shall be
placed under a constant tensile load equal to 60% of the specified minimum yield strength of
the steel, immersed in a solution of distilled water buffered with 0.5% (mass fraction) sodium
acetate trihydrate and adjusted to an initial pH of 4.0, using acetic acid.
The solution shall be continuously saturated at room temperature and pressure with 0.414kPa
(0.06lb/in ) hydrogen sulphide (balance nitrogen). The tested specimens shall not fail within a
test duration of 144hr.
A.4.
CORROSION TESTS, ALUMINIUM
Corrosion tests for aluminium alloys shall be carried out in accordance with Annex A of
ISO/DIS 7866 and meet the requirements therein.

A.9.
A.9.1.
COATING TESTS (mandatory if Paragraph 6.12. (c)) of Annex 3A is used)
Coating Performance Tests
Coatings shall be evaluated using the following test methods, or using equivalent National
Standards.
(a)
(b)
(c)
(d)
(e)
(f)
(g)
adhesion testing in accordance with ISO 4624 using Method A or B as applicable. The
coating shall exhibit an adhesion rating of either 4A or 4B, as applicable;
flexibility in accordance with ASTM D522 Mandrel Bend Test of Attached Organic
Coatings, using Test Method B with a 12.7mm (0.5in) mandrel at the specified thickness
at -20°C. Samples for the flexibility test shall be prepared in accordance with the
ASTM D522 standard. There shall not be any visually apparent cracks;
impact resistance in accordance with ASTM D2794 Test method for Resistance of
Organic Coatings to the Effects of Rapid Deformation (Impact). The coating at room
temperature shall pass a forward impact test of 18J (160in/lb);
chemical resistance when tested in general accordance with ASTM D1308 Effect of
Household Chemicals on Clear and Pigmented Organic Finishes. The tests shall be
conducted using the Open Spot Test Method and 100h exposure to a 30% sulfuric acid
solution (battery acid with a specific gravity of 1.219) and 24h exposure to a polyalkalene
glycol (e.g. brake fluid). There shall be no evidence of lifting, blistering or softening of the
coating. The adhesion shall meet a rating of 3 when tested in accordance with ASTM
D3359;
minimum 1,000h exposure in accordance with ASTM G53 Practice for Operating
Light and Water-Exposure Apparatus (Fluorescent W-Condensation Type) for Exposure
of non-metallic Materials. There shall be no evidence of blistering, and adhesion shall
meet a rating of 3 when tested in accordance with ISO 4624. The maximum gloss loss
allowed is 20%;
minimum 500h exposure in accordance with ASTM B117 Test Method of Salt Spray
(Fog) Testing. Undercutting shall not exceed 3mm at the scribe mark, there shall be no
evidence of blistering, and adhesion shall meet a rating of 3 when tested in accordance
with ASTM D3359;
resistance to chipping at room temperature using the ASTM D3170 Chipping Resistance
of Coatings. The coating shall have a rating of 7A or better, and there shall not be any
exposure of the substrate;
A.9.2.
Coating Batch Tests
(a)
Coating thickness
The thickness of the coating shall meet the requirements of the design when tested in
accordance with ISO 2808;
(b)
Coating Adhesion
The coating adhesion strength shall be measured in accordance with ISO 4624, and
shall have a minimum rating of 4 when measured using either Test Method A or B, as
appropriate.

A.13.
AMBIENT TEMPERATURE PRESSURE CYCLING
Pressure cycling shall be performed in accordance with the following procedure:
(a)
(b)
fill the cylinder to be tested with a non-corrosive fluid such as oil, inhibited water or
glycol;
cycle the pressure in the cylinder between not more than 2MPa and not less than 26MPa
at a rate not to exceed 10 cycles per minute.
The number of cycles to failure shall be reported, along with the location and description of the
failure initiation.
A.14.
ACID ENVIRONMENT TEST
On a finished cylinder the following test procedure should be applied:
(a)
(b)
exposing a 150mm diameter area on the cylinder surface for 100h to a 30% sulfuric acid
solution (battery acid with a specific gravity of 1.219) while the cylinder is held at 26MPa;
the cylinder shall then be burst in accordance with the procedure defined in
Paragraph A.12. above and provide a burst pressure that exceeds 85% of the minimum
design burst pressure.
A.15.
A.15.1.
BONFIRE TEST
General
The bonfire tests are designed to demonstrate that finished cylinders complete with the fire
protection system (cylinder valve, pressure relief devices and/or integral thermal insulation)
specified in the design will not burst when tested under the specified fire conditions. Extreme
caution shall be exercised during fire testing in the event that cylinder rupture occurs;
A.15.2.
Cylinder set-up
Cylinders shall be placed horizontally with the cylinder bottom approximately 100mm above the
fire source;
Metallic shielding shall be used to prevent direct flame impingement on cylinder valves, fittings,
and/or pressure relief devices. The metallic shielding shall not be in direct contact with the
specified fire protection system (pressure relief devices or cylinder valve). Any failure during the
test of a valve, fitting or tubing that is not part of the intended protection system for the design
shall invalidate the result.
A.15.3.
Fire Source
A uniform fire source of 1.65m length shall provide direct flame impingement on the cylinder
surface across its entire diameter.
Any fuel may be used for the fire source provided it supplies uniform heat sufficient to maintain
the specified test temperatures until the cylinder is vented. The selection of fuel should take
into consideration air pollution concerns. The arrangement of the fire shall be recorded in
sufficient detail to ensure the rate of heat input to the cylinder is reproducible. Any failure or
inconsistency of the fire source during a test invalidates the result;

A.16.
PENETRATION TESTS
A cylinder pressurised to 20MPa ± 1MPa with compressed gas shall be penetrated by an
armour piercing bullet with a diameter of 7.62mm or greater. The bullet shall completely
penetrate at least one side wall of the cylinder. For Type CNG-2, CNG-3 and CNG-4 designs,
the projectile shall impact the side wall at an approximate angle of 45°. The cylinder shall
reveal no evidence of fragmentation failure. Loss of small pieces of material, each not weighing
more than 45g, shall not constitute failure of the test. The approximate size of entrance and exit
openings and their locations shall be recorded.
A.17.
COMPOSITE FLAW TOLERANCE TESTS
For Type CNG-2, CNG-3 and CNG-4 designs only, one finished cylinder, complete with
protective coating, shall have flaws in the longitudinal direction cut into the composite. The
flaws shall be greater than the visual inspection limits as specified by the manufacturer.
The flawed cylinder shall then be pressure cycled from not more than 2MPa to not less than
26MPa for 3,000 cycles, followed by an additional 12,000 cycles at ambient temperature; The
cylinder shall not leak or rupture within the first 3,000 cycles, but may fail by leakage during the
last 12,000 cycles. All cylinders which complete this test shall be destroyed.
A.18.
HIGH TEMPERATURE CREEP TEST
This test is required for all Type CNG-4 designs, and all Type CNG-2 and CNG-3 designs in
which the glass transition temperature of the resin matrix does not exceed the maximum design
material temperature given in Paragraph 4.4.2. of Annex 3A by at least 20°C. One finished
cylinder shall be tested as follows:
(a)
(b)
The cylinder shall be pressurised to 26MPa and held at a temperature of 100°C for not
less than 200hr;
Following the test, the cylinder shall meet the requirements of the hydrostatic expansion
test A.11., the leak test A.10., and the burst test A.12. above.
A.19.
ACCELERATED STRESS RUPTURE TEST
For Type CNG-2, CNG-3, and CNG-4 designs only, one cylinder free of protective coating shall
be hydrostatically pressurised to 26MPa while immersed in water at 65°C. The cylinder shall be
held at this pressure and temperature for 1,000hr. The cylinder shall then be pressured to burst
in accordance with the procedure defined in Paragraph A.12 above except that the burst
pressure shall exceed 85% of the minimum design burst pressure;

(c)
(d)
Exposed brass pressure retaining components of pressure relief devices shall withstand,
without stress corrosion cracking, a mercurous nitrate test as described in ASTM B154.
The pressure relief device shall be immersed for 30min in an aqueous mercurous nitrate
solution containing 10g of mercurous nitrate and 10ml of nitric acid per litre of solution.
Following the immersion, the pressure relief device shall be leak tested by applying an
aerostatic pressure of 26MPa for one minute during which time the component shall be
checked for external leakage; Any leakage shall not exceed 200cm /h;
Exposed stainless steel pressure retaining components of pressure relief devices shall
be made of an alloy type resistant to chloride induced stress corrosion cracking;
A.25.
BOSS TORQUE TEST
The body of the cylinder shall be restrained against rotation and a torque of 500Nm shall be
applied to each end boss of the cylinder, first in the direction to tighten a threaded connection,
then in the untightening direction, and finally again in the tightening direction.
A.26.
RESIN SHEAR STRENGTH
Resin materials shall be tested on a sample coupon representative of the composite over-wrap
in accordance with ASTM D2344, or an equivalent National Standard. Following a 24h water
boil the composite shall have a minimum shear strength of 13.8MPa.
A.27.
NATURAL GAS CYCLING TEST
One finished cylinder shall be pressure cycled using compressed natural gas from less than
2MPa to working pressure for 300 cycles. Each cycle, consisting of the filling and venting of the
cylinder, shall not exceed 1hr. The cylinder shall be leak tested in accordance with Paragraph
A.10 above and meet the requirements therein. Following the completion of the natural gas
cycling the cylinder shall be sectioned and the liner/end boss interface inspected for evidence
of any deterioration, such as fatigue cracking or electrostatic discharge.
NOTE - Special consideration shall be given to safety when conducting this test. Prior to
conducting this test, cylinders of this design shall have successfully passed the test
requirements of Paragraph A.12 above (hydrostatic pressure burst test), Paragraph 8.6.3 of
Annex 3A (ambient temperature pressure cycling test) and Paragraph A.21 above (permeation
test). Prior to conducting this test, the specific cylinders to be tested shall pass the test
requirements of Paragraph A.10 above (leak test).
A.28.
BEND TEST, WELDED STAINLESS STEEL LINERS
Bend tests shall be carried out on material taken from the cylindrical part of a welded
stainless steel liner and tested in accordance with the method described in Paragraph 8.5. of
EN 13322-2. The test piece shall not crack when bent inwards around a former until the inside
edges are not further apart than the diameter of the former.
ANNEX 3A – APPENDIX B
(NOT ALLOCATED)
ANNEX 3A – APPENDIX C
(NOT ALLOCATED)

FORM 1
REPORT OF MANUFACTURER AND CERTIFICATE OF CONFORMITY
Manufactured by:
Located at:
Regulatory Registration Number:
Manufacturers Mark and Number:
Serial Number: from ....................................................
to…………………. Inclusive……………………..
Cylinder description:
SIZE: Outside diameter: ......................................... mm; Length: ....................................................... mm;
Marks stamped on shoulder or on labels of the cylinder are:
(a)
"CNG only": ..........................................................................................................................................
(b)
"DO NOT USE AFTER": .......................................................................................................................
(c)
Manufacturer's mark: ............................................................................................................................
(d)
Serial and part number: ........................................................................................................................
(e)
Working pressure in MPa: ....................................................................................................................
(f)
Regulation: ...........................................................................................................................................
(g)
Fire protection type: ..............................................................................................................................
(h)
Date of original test (month & year): ....................................................................................................
(i)
Tare mass of empty cylinder (in kg): ....................................................................................................
(j)
Authorised Body or Inspectors Mark: ...................................................................................................
(k)
Water capacity in L: ..............................................................................................................................
(l)
Test pressure in MPa: ..........................................................................................................................
(m)
Any special instructions: .......................................................................................................................
Each cylinder was made in compliance with all requirements of Regulation No. ... in accordance with the
cylinder description above. Required reports of test results are attached.
I hereby certify that all these test results proved satisfactory in every way and are in compliance with the
requirements for the type listed above.
Comments : ....................................................................................................................................................
Type Approval Authority: ................................................................................................................................
Inspector’s signature: .....................................................................................................................................
Manufacturer's signature: ...............................................................................................................................
Place, Date: ....................................................................................................................................................

ANNEX 3A – APPENDIX F
FRACTURE PERFORMANCE METHODS
F.1.
DETERMINATION OF FATIGUE SENSITIVE SITES
The location and orientation of fatigue failure in cylinders shall be determined by appropriate
stress analysis or by full scale fatigue tests on finished cylinders as required under the design
qualification tests for each type of design. If finite element stress analysis is used, the fatigue
sensitive site shall be identified based on the location and orientation of the highest tensile
principal stress concentration in the cylinder wall or liner at the working pressure.
F.2.
F.2.1.
LEAK-BEFORE-BREAK (LBB)
Engineering critical assessment This analysis may be carried out to establish that the finished
cylinder will leak in the event of a defect in the cylinder or liner growing into a through-wall
crack. A leak-before-break assessment shall be performed at the cylinder side wall. If the
fatigue sensitive location is outside the side wall, a leak-before-break assessment shall also be
performed at that location using a Level II approach as outlined in BS PD6493. The
assessment shall include the following steps:
(a)
(b)
(c)
(d)
(e)
Measure the maximum length (i.e. major axis) of the resultant through-wall surface crack
(usually elliptical in shape) from the three cylinder cycle tested under the design
qualification tests (according to Paragraphs A.13 and A.14 of Appendix A to this Annex)
for each type of design. Use the longest crack length of the three cylinders in the
analysis. Model a semi-elliptical through-wall crack with a major axis equal to twice the
measured longest major axis and with a minor axis equal to 0.9 of wall thickness. The
semi-elliptical crack shall be modelled at the locations specified in Paragraph F.1. above.
The crack shall be oriented such that the highest tensile principal stress shall drive the
crack;
Stress levels in the wall/liner at 26MPa obtained from the stress analysis as outlined in
Paragraph 6.6 of Annex 3A shall be used for the assessment. Appropriate crack driving
forces shall be calculated using either Section 9.2 or 9.3 of BS PD6493;
Fracture toughness of the finished cylinder or the liner from a finished cylinder, as
determined at room temperature for aluminium and at -40°C for steel, shall be
established using a standardised testing technique (either ISO/DIS 12737 or
ASTM 813-89 or BS 7448) in accordance with Sections 8.4 and 8.5 of BS PD6493;
Plastic collapse ratio shall be calculated in accordance with Section 9.4 of
BS PD6493-91;
The modelled flaw shall be acceptable in accordance with Section 11.2 of
BS PD6493-91.

(d)
Acceptance criteria for the flawed cylinder test
The cylinder passes the tests if the following conditions are met:
(i)
For monotonic pressurisation burst test, the failed pressure shall be equal or
greater than 26MPa;
For monotonic pressurised burst test, a total crack length measured on the external
surface of 1.1 times the original machined length is allowed.
(ii)
For cycle tested cylinders, fatigue crack growth beyond the original machined flaw
length is allowed. However, the failure mode shall be a "leak". Propagation of the
flaw by fatigue should occur over at least 90% of the length of the original
machined flaw;
Note: If these requirements are not fulfilled (failure occurs below 26MPa, even and if
the failure is a leak), a new test can be performed with a less deep flaw. Also, if
rupture type failure occurs at a pressure greater than 26MPa and flaw depth is
shallow, a new test can be performed with a deeper flaw.
F.3.
F.3.1.
DEFECT SIZE FOR NON-DESTRUCTIVE EXAMINATION (NDE)
NDE Defect Size by Engineering Critical Assessment
Calculations shall be performed in accordance with British Standard (BS) PD 6493, Section 3,
using the following steps:
(a)
(b)
(c)
Fatigue cracks shall be modelled at the high stress location in the wall/liner as planar
flaws;
The applied stress range at the fatigue sensitive site, due to a pressure between 2MPa
and 20MPa, shall be established from the stress analysis as outlined in Paragraph F.1.
of this Appendix;
The bending and membrane stress component may be used separately;
(d) The minimum number of pressure cycles is 15,000;
(e)
(f)
The fatigue crack propagation data shall be determined in air in accordance with
ASTM E647. The crack plane orientation shall be in the C-L direction (i.e., crack plane
perpendicular to the circumferences and along the axis of the cylinder), as illustrated in
ASTM E399. The rate shall be determined as an average of 3 specimen tests. Where
specific fatigue crack propagation data are available for the material and service
condition, they may be used in the assessment.
The amount of crack growth in the thickness direction and in the length direction per
pressures cycle shall be determined in accordance with the steps outlined in
Section 14.2 of the BS PD 6493-91 standard by integrating the relationship between the
rate of fatigue crack propagation, as established in (e) above, and the range of crack
driving force corresponding to the applied pressure cycle;

ANNEX 3A – APPENDIX G
INSTRUCTIONS BY THE CONTAINER MANUFACTURER REGARDING
HANDLING, USE AND INSPECTION OF CYLINDERS
G.1.
GENERAL
The primary function of this Appendix is to provide guidance to the cylinder purchaser,
distributor, installer and user for the safe use of the cylinder over its intended service life.
G.2.
DISTRIBUTION
The manufacturer shall advise the purchaser that the instructions shall be supplied to all parties
involved in the distribution, handling, installation and use of the cylinders; The document may
be reproduced to provide sufficient copies for this purpose, however it shall be marked to
provide reference to the cylinders being delivered;
G.3.
REFERENCE TO EXISTING CODES, STANDARDS AND REGULATIONS
Specific instructions may be stated by reference to national or recognised codes, standards
and regulations.
G.4.
CYLINDER HANDLING
Handling procedures shall be provided to ensure that the cylinders will not suffer unacceptable
damage or contamination during handling.
G.5.
INSTALLATION
Installation instructions shall be provided to ensure that the cylinders will not suffer
unacceptable damage during installation and during normal operation over the intended service
life.
Where the mounting is specified by the manufacturer, the instructions shall contain where
relevant, details such as mounting design, the use of resilient gasket materials, the correct
tightening torques and avoidance of direct exposure of the cylinder to an environment of
chemical and mechanical contacts.
Where the mounting is not specified by the manufacturer, the manufacturer shall draw the
purchaser's attention to possible long term impacts of the vehicle mounting system, for
example: vehicle body movements and cylinder expansion/contraction in the pressure and
temperature conditions of service.
Where applicable, the purchaser's attention shall be drawn to the need to provide installations
such that liquids or solids cannot be collected to cause cylinder material damage;
The correct pressure relief device to be fitted shall be specified.
G.6.
USE OF CYLINDERS
The manufacturer shall draw the purchaser's attention to the intended service conditions
specified by this Regulation, in particular the cylinder's allowable number of pressure cycles. Its
life in years, the gas quality limits and the allowable maximum pressures.

ANNEX 3A – APPENDIX H
ENVIRONMENTAL TEST
H.1.
SCOPE
The environmental test is intended to demonstrate that NGV cylinders can withstand exposure
to the automotive underbody environment and occasional exposure to other fluids. This test
was developed by the United States of America (USA) automotive industry in response to
cylinder failures initiated by stress corrosion cracking of the composite wrap.
H.2.
SUMMARY OF TEST METHOD
A cylinder is first preconditioned by a combination of pendulum and gravel impacts to simulate
potential underbody conditions. The cylinder is then subjected to a sequence of immersion in
simulated road salt/acid rain, exposure to other fluids, pressure cycles and high and low
temperature exposures. At the conclusion of the test sequence the cylinder will be hydraulically
pressured to destruction. The remaining residual burst strength of the cylinder shall be not less
than 85% of the minimum design burst strength.
H.3.
CYLINDER SET-UP AND PREPARATION
The cylinder shall be tested in a condition representative of installed geometry including coating
(if applicable), brackets and gaskets, and pressure fittings using the same sealing configuration
(i.e. O-rings) as that used in service. Brackets may be painted or coated prior to installation in
the immersion test if they are painted or coated prior to vehicle installation.
Cylinders will be tested horizontally and nominally divided along their horizontal centreline into
"upper" and "lower" sections. The lower section of the cylinder will be alternatively immersed in
road salt/acid rain environment and in heated or cooled air.
The upper section will be divided into 5 distinct areas and marked for preconditioning and fluid
exposure. The areas will be nominally 100mm in diameter. The areas shall not overlap on the
cylinder surface. While convenient for testing, the areas need not be oriented along a single
line, but shall not overlap the immersed section of the cylinder.
Although preconditioning and fluid exposure is performed on the cylindrical section of the
cylinder, all of the cylinder, including the domed sections, should be as resistant to the
exposure environments as are the exposed areas.

Figure H.2
Gravel Impact Test
H.5.
EXPOSURE ENVIRONMENTS
(a)
Immersion environment
At the specified stage in the test sequence (Table 1) the cylinder will be oriented
horizontally with the lower third of the cylinder diameter immersed in a simulated acid
rain/road salt water solution. The solution will consist of the following compounds:
Deionised water;
Sodium chloride: 2.5% by weight ±0.1%;
Calcium chloride: 2.5% by weight ±0.1%;
Sulfuric acid: Sufficient to achieve a solution pH of 4.0 ± 0.2;
Solution level and pH are to be adjusted prior to each test step which uses this liquid.
The temperature of the bath shall be 21 ± 5°C. During immersion, the unsubmerged
section of the cylinder shall be in ambient air.

H.7.
TEST PROCEDURE
(a)
Preconditioning of the cylinder
Each of the five areas marked for other fluid exposure on the upper section of the
cylinder shall be preconditioned by a single impact of the pendulum body summit at their
geometric centre. Following impact, the five areas shall be further conditioned by a
gravel impact application.
The central section of the bottom portion of the cylinder that will be submerged shall be
preconditioned by an impact of the pendulum body summit at three locations spaced
approximately 150mm apart.
Following impact, the same central section that was impacted shall be further
conditioned by a gravel impact application.
The cylinder shall be unpressured during preconditioning.
(b)
Test sequence and cycles
The sequence of the environment exposure, pressure cycles, and temperature to be
used are defined in Table 1.
The cylinder surface is not to be washed or wiped between stages.
H.8.
ACCEPTABLE RESULTS
Following the above test sequence, the cylinder shall be hydraulically tested to destruction in
accordance with the procedure in Paragraph A.12 of Appendix A to this Annex. The burst
pressure of the cylinder shall be not less than 85% of the minimum design burst pressure.
Test steps
Table H.1
Test Conditions and Sequence
Exposure
environments
Number of pressure
cycles
Temperature
1
Other fluids

Ambient
2
Immersion
1,875
Ambient
3
Air
1,875
High
4
Other fluids

Ambient
5
Immersion
1,875
Ambient
6
Air
3,750
Low
7
Other fluids

Ambient
8
Immersion
1,875
Ambient
9
Air
1,875
High
10
Other fluids

Ambient
11
Immersion
1,875
Ambient

2.1.3. Periodic Requalification
Recommendations for periodic requalification by visual inspection or testing during the service
life shall be provided by the tank manufacturer on the basis of use under service conditions
specified herein. Each tank shall be visually inspected at least every 120 months after the date
of its entry into service on the vehicle (vehicle registration), and at the time of any reinstallation,
for external damage and deterioration, including under the support straps. The visual inspection
shall be performed by a Technical Service designated or recognized by the Type Approval
Authority, in accordance with the manufacturer's specifications: tanks without labels containing
mandatory information, or with labels containing mandatory information that are illegible in any
way shall be removed from service. If the tank can be positively identified by manufacturer and
serial number, a replacement label may be applied, allowing the tank to remain in service.
2.1.4. Tanks Involved in Collisions
Tanks that have been involved in a vehicle collision shall be re-inspected by an agency
authorized by the manufacturer, unless otherwise directed by the Competent Authority having
jurisdiction. Tanks that have not experienced any impact damage from the collision may be
returned to service, otherwise the tank shall be returned to the manufacturer for evaluation.
2.1.5. Tanks Involved in Fires
Tanks that have been subject to the action of fire shall be re-inspected by an agency
authorized by the manufacturer, or condemned and removed from service.
2.2. Maximum Pressure
The maximum allowable working pressure (MAWP) shall be defined by the manufacturer and
correspond to the nominal primary relief valve setting. The maximum allowable working
pressure shall be less than 26MPa.
2.3. Temperature Range
Temperature of liquid in tanks may vary from a minimum of -195°C to a maximum of 65°C.
2.4. Gas Composition
Hydrogen shall be limited to 2% by volume when tanks are manufactured from steel with an
ultimate tensile strength exceeding 950MPa.
2.5. External Surfaces
Tanks are not designed for continuous exposure to mechanical or chemical attack, e.g. leakage
from cargo that may be carried on vehicles or severe abrasion damage from road conditions,
and shall comply with recognized installation standards. However, tank external surfaces may
be inadvertently exposed to:
(a)
(b)
Solvents, acids and alkalis, fertilizers; and
Automotive fluids, including gasoline, hydraulic fluids, glycol and oils.

3.3. Design Data
3.3.1. Drawings
Drawings shall show the following as a minimum:
(a)
(b)
(c)
(d)
(e)
(f)
Title, reference number, date of issue, and revision numbers with dates of issue if
applicable;
Reference to this Regulation and the tank type;
All pressure vessel dimensions complete with tolerances, including details of end closure
shapes with minimum thicknesses and of openings;
Mass, complete with tolerances, of tanks;
Material specifications complete with minimum mechanical and chemical properties or
tolerance ranges;
Other data such as minimum test pressure.
3.3.2. Stress Analysis Report
A stress analysis shall be provided;
Acceptable calculation methods include:
(a)
(b)
(c)
(d)
Finite element;
Finite difference;
Boundary element;
Other established method.
A table summarizing the calculated stresses in the report shall be provided.
3.3.3. Material Data
A detailed description of the materials and tolerances of the materials properties used in the
design shall be provided.
3.3.4. Design Qualification Test Data
The tank material, design, manufacture and examination shall be provided to be adequate for
their intended service by meeting the requirements of the tests required for the particular tank
design, when tested in accordance with the relevant methods of test detailed in Appendix A to
this Annex.
The test data also shall document the dimensions, wall thicknesses and weights of each of the
test tanks.

In order to ensure that the tanks are in compliance with this Regulation, they shall be subject to
inspection in accordance with Paragraph 4.10. performed by the Authority.
3.4.2. Test Certificate
If the results of prototype testing according to Paragraph 4.10. are satisfactory, the competent
Authority shall issue a test certificate. An example of a test certificate is given in Appendix D to
this Annex.
4. REQUIREMENTS
4.1. General
4.2. Design
The design of tanks shall cover all relevant aspects that are necessary to ensure that every
tank produced according to the design is fit for its purpose for the specified service life.
This Regulation does not provide design formulas, but requires the adequacy of the design to
be established by appropriate calculations and demonstrated by tanks being capable of
consistently passing the materials, design qualification and production tests specified in this
Regulation.
4.3. Materials
Materials used shall be suitable for the service conditions specified in Paragraph 2. The design
shall not have incompatible materials in contact. The design qualification tests for materials are
summarized in Table 6.1.
The materials of the fuel tank and its accessories shall be compatible, as applicable, with:
(a)
(b)
LNG;
Other media and fluids found in a vehicle environment such as coolants, brake fluid and
battery acid.
Materials used at low temperatures shall meet the toughness requirements of ISO 21028-1
(2004). For non-metallic materials, low temperature suitability shall be validated by an
experimental method, taking into account the service conditions.
The materials used for the outer jacket shall ensure the integrity of the insulation system and
shall be made of austenitic stainless steel and their elongation at fracture, at the temperature of
liquid nitrogen, shall be at least 12%.
For the inner vessel, it shall be ensured that the materials will resist all the in service fatigue
loads.
A corrosion allowance does not need to be added for the inner vessel. A corrosion allowance
does not need to be added on other surfaces, if they are protected against corrosion.
For welded vessels, welds shall have properties equivalent to those specified for the parent
material for all temperatures that the material may encounter.

(b)
Periodic service inspections, tests and acceptance criteria. The interval of visual
re-inspection of the external tank surfaces shall be in accordance with Paragraph 2.1.3.
of this Annex. A guide for manufacturer's instructions for handling, use and inspection is
provided in Appendix B to this Annex.
4.7. Fire Protection
All tanks shall be protected from fire with pressure relief devices. The tank, its materials,
pressure relief devices and any added insulation or protective material shall be designed to
collectively ensure adequate safety during fire conditions in the test specified in Paragraph A.1.
(Annex 3B, Appendix A).
Pressure relief devices shall be tested in accordance with Paragraph A.1. (Annex 3B,
Appendix A).
4.8. (Reserved)
4.9. Tank supports
The manufacturer shall specify the means by which the tank(s) shall be supported for
installation on vehicles. The manufacturer shall also supply installation instructions, including
maximum clamping force and torque to not cause unacceptable stress in the tank or damage to
the tank surface.
4.10. Design Qualification Tests
For the approval of each tank type the material, design, manufacture and examination shall be
proved to be adequate for their intended service by meeting the appropriate requirements of
the material qualification tests summarized in Table 6.1 of this Annex and the tank qualification
tests summarized in Table 6.2 of this Annex, with all tests in accordance with the relevant
methods of test as described in Appendix A to this Annex. The test tank shall be selected and
the tests witnessed by the competent Authority. If more tanks are subjected to the tests than
are required by this Annex, all results shall be documented.
4.11. Production Examinations and Tests
Descriptions of production examinations and tests shall be provided.
The following shall be in accordance with EN 1251-2 2000:
(a)
(b)
(c)
(d)
(e)
Inspection stages;
Production control test plans;
Non-destructive testing;
Rectification;
Pressure testing.

Table 6.3
Critical Production Inspection Requirements
Quality inspection
Production control test plates
Non-destructive testing
Pressure testing
Table 6.4
Change of Design
Type of test
Design change A.1 Bonfire A.2 Drop A.3 Hold-time
Diameter >20% X X X
Length >50% X X X
Working pressure >20% X X X
Insulation material/method X X
4.14. Pressure Testing
Each tank shall be pressure tested in accordance with Paragraph A.4. (Annex 3B, Appendix A).
4.15. Tank Design Qualification Tests
4.15.1. General
Qualification testing shall be conducted on finished tanks that are representative of normal
production and complete with identification marks. Selection, witnessing and documentation of
the results shall be in accordance with Paragraph 4.11. above.
4.15.2. Bonfire Test
Tests shall be conducted in accordance with Paragraph A.1 (Annex 3B, Appendix A) and meet
the requirements therein.

6. PREPARATIONS FOR DISPATCH
Prior to dispatch from the manufacturer's shop, every tank shall be internally clean. Tanks not
immediately closed by the fitting of a valve, and safety devices if applicable, shall have plugs,
which prevent entry of moisture and protect threads, fitted to all openings.
The manufacturer's statement of service and all necessary information to ensure the proper
handling, use and in-service inspection of the tanks shall be supplied to the purchaser. The
statement shall be in accordance with Appendix D to this Annex.

A.1.6.
Acceptable Results
The holding time of the fuel tank, which is the lapse of time before the opening of the pressure
relief valve, shall not be less than 5min under an external fire.
The fuel tank shall not burst and the pressure inside the inner tank shall not exceed the
permissible fault range of the inner tank. The secondary pressure valve shall limit the pressure
inside the inner tank to the test pressure specified in Paragraph 4.4. of Annex 3B.
A.2.
DROP TEST
Each family of fuel tanks shall be drop tested to verify tank integrity. Drop tests shall include a 9
m drop test of the fuel tank on the most critical area of the tank (other than the piping end) and
3m drop test on the piping end. Tank shall contain an equivalent full weight of liquid nitrogen
saturated to one-half the working pressure. There shall be no loss of product for a period of one
hour subsequent to the drop test other than relief valve operation and vapour between the filler
neck and the secondary check valve in the case of a drop test involving the filler neck. Loss of
vacuum, denting of the vessel, piping and piping protection, and damage to the support
structure system are acceptable.
The tank shall be subject to a vertical drop test so that it falls on rigid, flat, non-resilient,
smooth, and horizontal surface on areas defined below. To do so, the tank is suspended at a
minimum height defined above the ground at a point diametrically opposite the impact area, so
that the centre of gravity is vertically above
Fuel pumps and other tank attachments shall also meet the drop test requirements for the tank
and be attached as part of the tests.
A.3.
HOLD-TIME TEST
The tank shall be filled within 10% of maximum allowed net quantity of LNG at manufacturer's
specified highest point in the design filling temperature / pressure range. Hydrostatic pressure
shall be recorded every minute for at least 120h at ambient temperature of 20ºC ± 5°C.
Hydrostatic pressure shall be stable (within 10kPa) or increasing throughout duration of test.
The combined tank and contents weight shall be measured and verified to be stable
(within 1%) throughout duration of test; release of any fluid (bubble tight) during duration of test
shall be unacceptable. Acceptable measured hydrostatic pressure at 120 or more hours shall
be less than nominal primary relief valve pressure setting of the tank. If hydrostatic pressure is
less than nominal primary relief valve pressure setting at 120h, the test may be continued until
that pressure is reached and manufacturer's highest point in the design filling
temperature/pressure range may be defined as the hydrostatic pressure recorded 120h prior to
reaching the nominal primary relief valve pressure setting. The manufacturer may also specify
a longer hold-time than 120h, or a hold-time (longer than 120h) versus design filling
temperature / pressure relationship based on the recorded hydrostatic pressure time history.
A.4.
PRESSURE TEST
Each inner vessel shall be examined under the test pressure defined in Paragraph 4.4. of
Annex 3B, maintained for at least 30s without evidence of leakage, visible distortion or other
defect.

ANNEX 3B – APPENDIX C
INSTRUCTIONS BY THE TANKS MANUFACTURER ON HANDLING, USE AND INSPECTION OF
TANKS
C.1.
GENERAL
The primary function of this appendix is to provide guidance to the tank purchaser, distributor,
installer and user for the safe use of the tank over its intended service life.
C.2.
DISTRIBUTION
The manufacturer shall advise the purchaser that the instructions shall be supplied to all parties
involved in the distribution, handling, installation and use of the tank. The document may be
reproduced to provide sufficient copies for this purpose, however, it shall be marked to provide
reference to the tank being delivered;
C.3.
REFERENCE TO EXISTING CODES, STANDARDS AND REGULATIONS
Specific instructions may be stated by reference to national or recognised codes, standards
and regulations.
C.4.
TANK HANDLING
Handling procedures shall be provided to ensure that the tank will not suffer unacceptable
damage or contamination during handling.
C.5.
INSTALLATION
Installation instructions shall be provided to ensure that the tanks will not suffer unacceptable
damage during installation and during normal operation over the intended service life.
Where the mounting is specified by the manufacturer, the instructions shall contain where
relevant, details such as mounting design, the use of resilient gasket materials, the correct
tightening torques and avoidance of direct exposure of the tank to an environment of chemical
and mechanical contacts.
Where the mounting is not specified by the manufacturer, the manufacturer shall draw the
purchaser's attention to possible long term impacts of the vehicle mounting system, for
example: vehicle body movements and tank expansion/contraction in the pressure and
temperature conditions of service.
Where applicable, the purchaser's attention shall be drawn to the need to provide installations
such that liquids or solids cannot be collected to cause tank material damage;
The correct pressure relief device to be fitted shall be specified.
C.6.
USE OF TANKS
The manufacturer shall draw the purchaser's attention to the intended service conditions
specified by this Regulation, in particular the tanks allowable maximum pressures.

ANNEX 3B – APPENDIX D
REPORT FORM 1
NOTE - This Appendix is not a mandatory part of this Annex.
The following forms should be used:
1.
Form 1: Report of manufacturer and certificate of conformity
2.
Manufactured by: ...........................................................................................................................
3.
Located at: .......................................................................................................................................
4.
Regulatory registration number: ......................................................................................................
5.
Manufacturers mark and number: ...................................................................................................
6.
Serial Number: from ............. to .............. inclusive .......................................................................
7.
Tank description: .............................................................................................................................
8.
SIZE: Outside diameter:
mm; Length:
mm;
9.
Marks stamped on shoulder or on labels of the tank are:
(a)
"LNG only": ..........................................................................................................................
(b)
"DO NOT USE AFTER": .......................................................................................................
(c)
"Manufacturer's mark": ..........................................................................................................
(d)
Serial and part number: ........................................................................................................
(e)
Working pressure in MPa: ....................................................................................................
(f)
Regulation No.: .....................................................................................................................
(g)
Fire protection type: ..............................................................................................................
(h)
Date of original test (month and year): ................................................................................
(i)
Tare mass of empty tank (in kg): .........................................................................................
(j)
Authorized body or inspectors mark: ....................................................................................
(k)
Water capacity in L: ..............................................................................................................
(l)
Test pressure in MPa: ...........................................................................................................
(m)
Any special instructions: .......................................................................................................

ANNEX 4A
PROVISIONS ON THE APPROVAL OF THE CNG AUTOMATIC VALVE,
NON-RETURN VALVE, PRESSURE RELIEF VALVE, PRESSURE RELIEF DEVICE
(TEMPERATURE TRIGGERED), EXCESS FLOW VALVE, MANUAL VALVE
AND THE PRESSURE RELIEF DEVICE (PRESSURE TRIGGERED)
1. The purpose of this Annex is to determine the provisions regarding the approval of the
automatic valve, the non-return valve, the pressure relief valve, the pressure relief device and
the excess flow valve.
2. THE CNG AUTOMATIC VALVE
2.1. The materials constituting the CNG automatic valve which are in contact with the CNG when
operating, shall be compatible with the test CNG. In order to verify this compatibility the
procedure described in Annex 5D shall be used.
2.2. Operating Specifications
2.2.1. The CNG automatic valve shall be so designed as to withstand a pressure of 1.5 times the
working pressure (MPa) without leakage and deformation.
2.2.2. The CNG automatic valve shall be so designed as to be leak-proof at a pressure of 1.5 times
the working pressure (MPa) (see Annex 5B).
2.2.3. The CNG automatic valve, being in the normal position of use specified by the manufacturer, is
submitted to 20,000 operations; then it is deactivated. The automatic valve shall remain
leak-proof at a pressure of 1.5 times the working pressure (MPa) (see Annex 5B).
2.2.4. If the automatic valve is closed during commanded stop phases, the valve shall be submitted to
the following numbers of operations during test according Paragraph 2.2.3. above:
(a)
(b)
(c)
200,000 cycles (mark "H1") if the engine shuts off automatically when the vehicle comes
to a halt;
500,000 cycles (mark "H2") if, in addition to (a), the engine also shuts off automatically
when the vehicle drives with the electric motor only;
1,000,000 cycles (mark "H3") if, in addition to (a) or (b), the engine also shuts off
automatically when the accelerator pedal is released.
Notwithstanding the above-mentioned provisions, the valve complying with (b) shall be deemed
to satisfy (a), and the valve complying with (c) shall be deemed to satisfy (a) and (b).
2.2.5. The CNG automatic valve shall be so designed to operate at temperatures as specified in
Annex 5O.

4.2.5. The pressure relief device shall be so designed to open the fuse at a temperature of
110°C ± 10°C.
4.2.6. The pressure relief valve of Class 0 shall be so designed to operate at temperatures
from -40°C to 85°C.
4.2.7. The pressure relief valve of Class 6 shall be so designed to operate at temperatures as
specified in Annex 5O.
4.3. The pressure relief valve and pressure relief device have to comply with the test procedures for
the Class component determined according to the scheme in Figure 1-1 of Paragraph 3 of this
Regulation.
5. THE EXCESS FLOW VALVE
5.1. The materials constituting the excess flow valve which are in contact with the CNG when
operating, shall be compatible with the test CNG. In order to verify this compatibility, the
procedure described in Annex 5D shall be used.
5.2. Operating Specifications
5.2.1. The excess flow valve, if it is not integrated in the cylinder, shall be so designed as to withstand
a pressure of 1.5 times the working pressure (MPa).
5.2.2. The excess flow valve shall be so designed as to be leak-proof at a pressure of 1.5 times the
working pressure (MPa).
5.2.3. The excess flow valve shall be so designed to operate at temperatures as specified in
Annex 5O.
5.3. The excess flow valve shall be mounted inside the container.
5.4. The excess flow valve shall be designed with a bypass to allow for equalisation of pressures.
5.5. The excess flow valve shall cut off at a pressure difference over the value of 650kPa.
5.6. When the excess flow valve is at cut-off position, the by-pass flow through the valve shall not
exceed 0.05 normal m /min. at a differential pressure of 10,000kPa.
5.7. The device has to comply with the test procedures for the Class components, specified in the
scheme in Figure 1-1 of Paragraph 3 of this Regulation, except overpressure, external leakage,
resistance to dry heat test, ozone ageing.
6. THE MANUAL VALVE
6.1. The manual valve device in Class 0 shall be designed to withstand a pressure of 1.5 times the
working pressure.
6.2. The manual valve device in Class 0 shall be designed to operate at a temperature from -40°C
to 85°C.
6.3. The manual valve device in Class 6 shall be designed to withstand a pressure of 1.5 times the
working pressure.

7.4.1.2. Requirements
7.4.1.2.1. At the completion of the test, the component shall not leak more than 15cm /h when
submitted to a gas pressure equal to the maximum working pressure at ambient temperature
and at the maximum operating temperature as indicated in Annex 5O.
7.4.1.2.2. At the completion of the test, the PRD (pressure triggered) burst pressure shall be
34MPa ± 10% at ambient temperature and at the maximum operating temperature as
indicated in Annex 5O.
7.4.2. Corrosion Resistance Test
7.4.2.1. Test Procedure
The PRD (pressure triggered) shall be subjected to the test procedure described in Annex 5E,
except the leakage test.
7.4.2.2. Requirements
7.4.2.2.1. At the completion of the test, the component shall not leak more than 15cm /h when
submitted to a gas pressure equal to the maximum working pressure at ambient temperature
and at the maximum operating temperature as indicated in Annex 5O.
7.4.2.2.2. At the completion of the test, the Class 0 PRD (pressure triggered) burst pressure shall be
34MPa ± 10% at ambient temperature and at the maximum operating temperature as
indicated in Annex 5O.
7.4.2.2.3. At the completion of the test, the Class 6 PRD (pressure triggered) burst pressure shall be at
least 1.5 times working pressure at ambient temperature and at the maximum operating
temperature as indicated in Annex 5O.

1.3. Specifications and Tests for the Lining
1.3.1. Tensile strength and elongation for rubber material and for thermoplastic elastomers (TPE)
1.3.1.1. Tensile strength and elongation at break according to ISO 37. Tensile strength not less than
20MPa and elongation at break not less than 250%.
1.3.1.2. Resistance to n-pentane according to ISO 1817 with the following conditions:
(a)
medium: n-pentane
(b) temperature: 23°C (tolerance according to ISO 1817)
(c)
immersion period: 72hr
Requirements:
(a) maximum change in volume 20%
(b) maximum change in tensile strength 25%
(c) maximum change in elongation at break 30%
After storage in air with a temperature of 40°C for a period of 48h the mass compared to the
original value may not decrease more than 5%.
1.3.1.3. Resistance to ageing according to ISO 188 with the following conditions:
(a)
(b)
temperature: 115°C (test temperature = maximum operating temperature -10°C)
exposure period: 24 and 336hr
After ageing the specimens have to be conditioned at 23°C and 50% relative humidity for at
least 21 days prior to carrying out the tensile test according to Paragraph 1.3.1.1. above.
Requirements:
(a)
(b)
maximum change in tensile strength 35% after 336h ageing compared to the tensile
strength of the 24h aged material.
maximum change in elongation at break 25% after 336h ageing compared to the
elongation at break of the 24h aged material.

1.4. Specifications and Test-method for the Cover
1.4.1. Tensile strength and elongation for rubber material and for thermoplastic elastomers (TPE)
1.4.1.1. Tensile strength and elongation at break according to ISO 37. Tensile strength not less than
10MPa and elongation at break not less than 250%.
1.4.1.2. Resistance to n-hexane according to ISO 1817 with the following conditions:
(a)
medium: n-hexane
(b) temperature: 23°C (tolerance according to ISO 1817)
(c)
immersion period: 72hr
Requirements:
(a) maximum change in volume 30%
(b) maximum change in tensile strength 35%
(c) maximum change in elongation at break 35%
1.4.1.3. Resistance to ageing according to ISO 188 with the following conditions:
(a)
(b)
temperature: 115°C (test temperature = maximum operating temperature -10°C)
exposure period: 24 and 336hr
After ageing, the specimens have to be conditioned at 23°C and 50% relative humidity for at
least 21 days prior to carrying out the tensile test according to Paragraph 1.4.1.1. above.
Requirements:
(a)
(b)
maximum change in tensile strength 35% after 336h ageing compared to the tensile
strength of the 24h aged material.
maximum change in elongation at break 25% after 336h ageing compared to the
elongation at break of the 24h aged material.

1.4.3. Resistance to Ozone
1.4.3.1. The test has to be performed in compliance with Standard ISO 1431/1.
1.4.3.2. The test-pieces, which have to be stretched to an elongation of 20% shall have to be exposed
to air of 40°C with an ozone-concentration of 50 parts per hundred million during 120hr.
1.4.3.3. No cracking of the test pieces is allowed.
1.5. Specifications for Uncoupled Hose
1.5.1. Gas-tightness (Permeability)
1.5.1.1. A hose at a free length of 1m has to be connected to a container filled with liquid propane,
having a temperature of 23° ± 2°C.
1.5.1.2. The test has to be carried out in compliance with the method described in Standard ISO 4080.
1.5.1.3. The leakage through the wall of the hose shall not exceed 95cm per metre of hose per 24 h.
1.5.2. Resistance at Low Temperature
1.5.2.1. The test has to be carried out in compliance with the method described in
Standard ISO 4672-1978, Method B.
1.5.2.2. Test-temperature: -40°C ± 3°C
or -20°C ± 3°C, if applicable.
1.5.2.3. No cracking or rupture is allowed.
1.5.3. Bending Test
1.5.3.1. An empty hose, at a length of approximately 3.5m shall be able to withstand 3,000 times the
hereafter prescribed alternating-bending-test without breaking. After the test the hose shall be
capable of withstanding the test-pressure as mentioned in Paragraph 1.5.4.2. below The test
shall be performed on both new hose and after ageing according to ISO 188 as prescribed in
Paragraph 1.4.2.3. and subsequently to ISO 1817 as prescribed in Paragraph 1.4.2.2. above.

1.5.3.4. The hose shall be S-shape-like installed over the wheels (see Figure 1).
The end, that runs over the upper wheel shall be furnished with a sufficient mass as to achieve
a complete snuggling of the hose against the wheels. The part that runs over the lower wheel is
attached to the propulsion-mechanism.
The mechanism shall be so adjusted, that the hose travels a total distance of 1.2m in both
directions.
1.5.4. Hydraulic-Test-Pressure and Appointment of the Minimum Burst-pressure
1.5.4.1. The test has to be carried out in compliance with the method described in Standard ISO 1402.
1.5.4.2. The test-pressure of 1.5 times the working pressure (MPa) shall be applied during 10min,
without any leakage.
1.5.4.3. The burst pressure shall not be less than 45MPa.
1.6. Couplings
1.6.1. The couplings shall be made from steel or brass and the surface shall be corrosion-resistant.
1.6.2. The couplings shall be of the crimp-fitting type.
1.6.2.1. The swivel-nut shall be provided with U.N.F.-thread.
1.6.2.2. The sealing cone of swivel-nut type shall be of the type with a half vertical angle of 45°.
1.6.2.3. The couplings can be made as swivel-nut type or as quick-connector type.
1.6.2.4. It shall be impossible to disconnect the quick-connector type without specific measures or the
use of dedicated tools.
1.7. Assembly of Hose and Couplings
1.7.1. The construction of the couplings shall be such, that it is not necessary to peel the cover unless
the reinforcement of the hose consists of corrosion-resistant material.
1.7.2. The hose assembly has to be subjected to an impulse test in compliance with
Standard ISO 1436.
1.7.2.1. The test has to be completed with circulating oil having a temperature of 93°C, and a minimum
pressure of 26MPa (Class 0) or declared working pressure (Class 6).
1.7.2.2. The hose has to be subjected to 150,000 impulses.
1.7.2.3. After the impulse-test the hose has to withstand the test-pressure as mentioned in
Paragraph 1.5.4.2. above.
1.7.3. Gas-tightness
1.7.3.1. The hose assembly (hose with couplings) has to withstand during 5min a gas pressure of 1.5
times the working pressure (MPa) without any leakage.

2.3.1.2. Resistance to n-pentane according to ISO 1817 with the following conditions:
(a)
medium: n-pentane
(b) temperature: 23°C (tolerance according to ISO 1817)
(c)
immersion period: 72hr
Requirements:
(a) maximum change in volume 20%
(b) maximum change in tensile strength 25%
(c) maximum change in elongation at break 30%
After storage in air with a temperature of 40°C for a period of 48h the mass compared to the
original value may not decrease more than 5%.
2.3.1.3. Resistance to ageing according to ISO 188 with the following conditions:
(a)
(b)
temperature: 115°C (test temperature = maximum operating temperature -10°C)
exposure period: 24 and 336hr
After ageing the specimens have to be conditioned at 23°C and 50% relative humidity for at
least 21 days prior to carrying out the tensile test according to Paragraph 2.3.1.1. above.
Requirements:
(a)
(b)
maximum change in tensile strength 35% after 336h ageing compared to the tensile
strength of the 24h aged material.
maximum change in elongation at break 25% after 336h ageing compared to the
elongation at break of the 24h aged material.
2.3.2. Tensile strength and elongation specific for thermoplastic material.
2.3.2.1. Tensile strength and elongation at break according to ISO 527-2 with the following conditions:
(a)
(b)
specimen type: Type 1BA.
tensile speed: 20mm/min.
The material has to be conditioned for at least 21 days at 23°C and 50% relative humidity prior
to testing.
Requirement:
(a)
tensile strength not less than 20MPa.
(b) elongation at break not less than 100%.

Requirements:
(a) maximum change in volume 30%
(b) maximum change in tensile strength 35%
(c) maximum change in elongation at break 35%
2.4.1.3. Resistance to ageing according to ISO 188 with the following conditions:
(a)
(b)
temperature: 115°C (test temperature = maximum operating temperature -10°C)
exposure period: 24 and 336hr
After ageing the specimens have to be conditioned at 23°C and 50% relative humidity for at
least 21 days prior to carrying out the tensile test according to Paragraph 2.4.1.1. above.
Requirements:
(a)
(b)
maximum change in tensile strength 35% after 336h ageing compared to the tensile
strength of the 24h aged material.
maximum change in elongation at break 25% after 336h ageing compared to the
elongation at break of the 24h aged material.
2.4.2. Tensile strength and elongation specific for thermoplastic material.
2.4.2.1. Tensile strength and elongation at break according to ISO 527-2 with the following conditions:
(a)
(b)
specimen type: Type 1BA.
tensile speed: 20mm/min.
The material has to be conditioned for at least 21 days at 23°C and 50% relative humidity prior
to testing.
Requirements:
(a)
tensile strength not less than 20MPa.
(b) elongation at break not less than 100%.
2.4.2.2. Resistance to n-hexane according to ISO 1817 with the following conditions:
(a)
medium: n-hexane.
(b) temperature: 23°C (tolerance according to ISO 1817).
(c)
immersion period: 72hr.

2.5.2. Resistance at Low Temperature
2.5.2.1. The test has to be carried out in compliance with the method described in Standard ISO 4672 :
1978, Method B.
2.5.2.2. Test-temperature: -40°C ± 3°C; or
-20°C ± 3°C, if applicable.
2.5.2.3. No cracking or rupture is allowed.
2.5.3. Bending Test
2.5.3.1. An empty hose, at a length of approximately 3.5m shall be able to withstand 3,000 times the
hereafter prescribed alternating-bending-test without breaking. After the test the hose shall be
capable of withstanding the test-pressure as mentioned in Paragraph 2.5.4.2. below. The test
shall be performed on both new hose and after ageing according to ISO 188 as prescribed in
Paragraph 2.4.2.3. and subsequently to ISO 1817 as prescribed in Paragraph 2.4.2.2. above.
2.5.3.2.
Hose inside
diameter
[mm]
Bending radius
[mm]
(Figure 2)
Figure 2
(Example Only)
Distance between centres [mm]
(Figure 2)
Vertical
b
Horizontal
a
up to 13 102 241 102
13 to 16 153 356 153
from 16 to 20 178 419 178

2.7.2.2. The hose has to be subjected to 150,000 impulses.
2.7.2.3. After the impulse-test the hose has to withstand the test-pressure as mentioned in
Paragraph 2.5.4.2. above.
2.7.3. Gas-tightness
2.7.3.1. The hose assembly (hose with couplings) has to withstand during 5min a gas pressure of
3MPa without any leakage.
2.8. Markings
2.8.1. Every hose shall bear, at intervals of not greater than 0.5m, the following clearly legible and
indelible identification markings consisting of characters, figures or symbols.
2.8.1.1. The trade name or mark of the manufacturer.
2.8.1.2. The year and month of fabrication.
2.8.1.3. The size and type marking.
2.8.1.4. The identification-marking "CNG. Class 1".
2.8.2. Every coupling shall bear the trade name or mark of the assembling manufacturer.
3. LOW PRESSURE HOSES, CLASS 2 CLASSIFICATION
3.1. General specifications
3.1.1. The hose shall be so designed as to withstand a maximum working pressure of 450kPa.
3.1.2. The hose shall be so designed as to withstand temperatures as specified in Annex 5O.
3.1.3. The inside diameter shall be in compliance with Table 1 of Standard ISO 1307.
3.2. (Not Allocated)
3.3. Specifications and Tests for the Lining
3.3.1. Tensile strength and elongation for rubber material and for thermoplastic elastomers (TPE)
3.3.1.1. Tensile strength and elongation at break according to ISO 37
Tensile strength not less than 10MPa and elongation at break not less than 250%.

3.3.2.2. Resistance to n-pentane according to ISO 1817 with the following conditions:
(a)
medium: n-pentane.
(b) temperature: 23°C (tolerance according to ISO 1817).
(c)
immersion period: 72hr.
Requirements:
(a) maximum change in volume 2%.
(b) maximum change in tensile strength 10%.
(c) maximum change in elongation at break 10%.
After storage in air with a temperature of 40°C for a period of 48h the mass compared to the
original value may not decrease more than 5%.
3.3.2.3. Resistance to ageing according to ISO 188 with the following conditions:
(a)
(b)
temperature: 115°C (test temperature = maximum operating temperature -10°C).
exposure period: 24 and 336hr.
After ageing, the specimens have to be conditioned at 23°C and 50% relative humidity for at
least 21 days prior to carrying out the tensile test according to Paragraph 3.3.2.1. above.
Requirements:
(a)
(b)
maximum change in tensile strength 35% after 336h ageing compared to the tensile
strength of the 24h aged material.
maximum change in elongation at break 25% after 336h ageing compared to the
elongation at break of the 24h aged material.
3.4. Specifications and Test-Method for the Cover
3.4.1. Tensile strength and elongation for rubber material and for thermoplastic elastomers (TPE)
3.4.1.1. Tensile strength and elongation at break according to ISO 37
Tensile strength not less than 10MPa and elongation at break not less than 250%.

3.4.2.2. Resistance to n-hexane according to ISO 1817 with the following conditions:
(a)
medium: n-hexane.
(b) temperature: 23°C (tolerance according to ISO 1817).
(c)
immersion period: 72hr.
Requirements:
(a) maximum change in volume 2%.
(b) maximum change in tensile strength 10%.
(c) maximum change in elongation at break 10%.
After storage in air with a temperature of 40°C for a period of 48h the mass compared to the
original value may not decrease more than 5%.
3.4.2.3. Resistance to ageing according to ISO 188 with the following conditions:
(a)
(b)
temperature: 115°C (test temperature = maximum operating temperature -10°C).
exposure period: 24 and 336hr.
After ageing, the specimens have to be conditioned at 23°C and 50% relative humidity for at
least 21 days prior to carrying out the tensile test according to Paragraph 3.4.2.1. above.
Requirements:
(a)
(b)
maximum change in tensile strength 20% after 336h ageing compared to the tensile
strength of the 24h aged material.
maximum change in elongation at break 50% after 336h ageing compared to the
elongation at break of the 24h aged material.
3.4.3. Resistance to Ozone
3.4.3.1. The test has to be performed in compliance with Standard ISO 1431/1.
3.4.3.2. The test-pieces, which have to be stretched to an elongation of 20% shall have to be exposed
to air of 40°C and a relative humidity of 50% ± 10% with an ozone concentration of 50 parts per
hundred million during 120hr.
3.4.3.3. No cracking of the test pieces is allowed.

3.5.4. Bending Test
3.5.4.1. An empty hose, at a length of approximately 3.5m shall be able to withstand 3,000 times the
hereafter prescribed alternating-bending-test without breaking.
3.5.4.2.
Figure 3
(Example Only)
The testing machine (Figure 3) shall consist of a steel frame, provided with two wooden
wheels, with a rim width of approx. 130mm.
The circumference of the wheels shall be grooved for the guidance of the hose.
The radius of the wheels, measured to the bottom of the groove, shall be 102mm.
The longitudinal median planes of both wheels shall be in the same vertical plane. The distance
between the wheel-centres shall be vertical 241mm and horizontal 102mm.
Each wheel shall be able to rotate freely round its pivot-centre.
A propulsion-mechanism pulls the hose over the wheels at a speed of four complete motions
per minute.
3.5.4.3. The hose shall be S-shape-like installed over the wheels (see Figure 3).
The end, that runs over the upper wheel, shall be furnished with a sufficient mass as to achieve
a complete snuggling of the hose against the wheels. The part that runs over the lower wheel is
attached to the propulsion mechanism.
The mechanism shall be so adjusted, that the hose travels a total distance of 1.2m in both
directions.

4.3.1.2. Resistance to n-pentane according to ISO 1817 with the following conditions:
(a)
Medium: n-pentane;
(b) Temperature: 23°C (tolerance according to ISO 1817);
(c) Immersion period: 72h.
Requirements:
(a) Maximum change in volume 20%;
(b) Maximum change in tensile strength 25%;
(c) Maximum change in elongation at break 30%.
After storage in air with a temperature of 40°C for a period of 48h the mass compared to the
original value may not decrease more than 5%.
4.3.1.3. Resistance to ageing according to ISO 188 with the following conditions:
(a)
(b)
Temperature: 115°C (test temperature = maximum operating temperature -10°C);
Exposure period: 24 and 336h
After ageing the specimens have to be conditioned at 23°C and 50% relative humidity for at
least 21 days prior to carrying out the tensile test according to Paragraph 4.3.1.1. of this Annex.
Requirements:
(a)
(b)
Maximum change in tensile strength 35% after 336h ageing compared to the tensile
strength of the 24h aged material;
Maximum change in elongation at break 25% after 336h ageing compared to the
elongation at break of the 24h aged material.
4.3.2. Tensile strength and elongation specific for thermoplastic material.
4.3.2.1. Tensile strength and elongation at break according to ISO 527-2 with the following conditions:
(a)
(b)
Specimen type: type 1BA;
Tensile speed: 20mm/m.
The material has to be conditioned for at least 21 days at 23°C and 50% relative humidity prior
to testing.
Requirements:
(a)
Tensile strength not less than 20MPa;
(b) Elongation at break not less than 100%.

Requirements:
(a) Maximum change in volume 30%;
(b) Maximum change in tensile strength 35%;
(c) Maximum change in elongation at break 35%.
4.4.1.3. Resistance to ageing according to ISO 188 with the following conditions:
(a)
Temperature: 115°C (test temperature = maximum operating temperature -10°C);
(b) Exposure period: 24 and 336h.
After ageing, the specimens have to be conditioned at 23°C and 50% relative humidity for at
least 21 days prior to carrying out the tensile test according to Paragraph 4.4.1.1. of this Annex.
Requirements:
(a)
(b)
Maximum change in tensile strength 35% after 336h ageing compared to the tensile
strength of the 24h aged material;
Maximum change in elongation at break 25% after 336h ageing compared to the
elongation at break of the 24h aged material.
4.4.2. Tensile strength and elongation specific for thermoplastic material.
4.4.2.1. Tensile strength and elongation at break according to ISO 527-2 with the following conditions:
(a)
(b)
Specimen type: type 1BA;
Tensile speed: 20mm/minute.
The material has to be conditioned for at least 21 days at 23°C and 50% relative humidity prior
to testing.
Requirements:
(a)
Tensile strength not less than 20MPa;
(b) Elongation at break not less than 100%.
4.4.2.2. Resistance to n-hexane according to ISO 1817 with the following conditions:
(a)
Medium: n-hexane;
(b) Temperature: 23°C (tolerance according to ISO 1817);
(c) Immersion period: 72h.

4.5.2.2. Test temperature: -163°C (equivalent can be found in the table of Annex 5O)
4.5.2.3. No cracking or rupture is allowed.
4.5.3. Bending Test
4.5.3.1. The test has to be carried out in compliance with the method described in standard
ISO15500-17:2012
4.5.4. Hydraulic Test Pressure and Appointment of the Minimum Burst-Pressure
4.5.4.1. The test has to be carried out in compliance with the method described in standard ISO 1402.
Test temperature: -163°C (equivalent can be found in the table of Annex 5O)
4.5.4.2. The test pressure of 1.5 times the manufacture declared working pressure (MPa) shall be
applied during 10min, without any leakage.
4.5.4.3. The burst pressure shall not be less than 2.25 times the manufacture declared working
pressure (MPa).
4.5.5 Pull Off
4.5.5.1 The test has to be carried out in compliance with the method described in standard ISO15500-
17:2012.
4.5.6. Electrical Conductivity
4.5.6.1. The test has to be carried out in compliance with the method described in standard
ISO15500-17:2012.
4.5.7. Vibration
4.5.7.1. Mount one end of the test assembly on the static support and the other end on the vibration
head, making sure that the tubing is bent at the minimum bending radius of 180° preventing the
hose to kink.
Using cryogenic fluid, pressurize the test sample at the manufacture declared working
pressure.
Test temperature: -163°C (equivalent can be found in the table of Annex 5O).
Vibrate the component for 30min, pressurized, and sealed at the downstream side along each
of the three orthogonal axes at the most severe resonant frequency determined as follows:
(a)
(b)
(c)
By an acceleration of 1.5g;
Within a sinusoidal frequency range of 10Hz to 500Hz;
With a sweep time of 10min.
If the resonance frequency is not found in this range, the test shall be conducted at 500Hz.

ANNEX 4C
PROVISIONS ON THE APPROVAL OF THE CNG FILTER
1. The purpose of this Annex is to determine the provisions ON the approval of the CNG filter.
2. OPERATING CONDITIONS
2.1. The CNG filter shall be so designed to operate at temperatures as specified in Annex 5O.
2.2. CNG filter shall be Classified with regard to the maximum working pressure (see Figure 1-1
Paragraph 3. of this Regulation):
2.2.1. Class 0: The CNG filter shall be so designed to withstand a pressure of 1.5 times the working
pressure (MPa).
2.2.2. Class 6: The CNG filter shall be so designed to withstand a pressure of 1.5 times the working
pressure (MPa).
2.2.3. Class 1 and Class 2: The CNG filter shall be so designed to withstand a pressure twice the
working pressure.
2.2.4. Class 3: the CNG filter shall be so designed to withstand a pressure twice the relief pressure of
the pressure relief valve on which it is subject.
2.3. The materials used in the CNG filter which are in contact with CNG when operating, shall be
compatible with this gas (see Annex 5D).
2.4. The component has to comply with the test procedures for Class components according to the
scheme in Figure 1-1 of Paragraph 3. of this Regulation.

3. CLASSIFICATION AND TEST PRESSURES
3.1. The part of the pressure regulator which is in contact with the pressure of the container is
regarded as Class 0.
3.1.1. The Class 0 part of the pressure regulator shall be leak-proof (see Annex 5B) at a pressure up
to 1.5 times the working pressure (MPa) with the outlet(s) of that part closed off.
3.1.2. The Class 0 part of the pressure regulator shall withstand a pressure up to 1.5 times the
working pressure (MPa).
3.1.3. The Class 1 and Class 2 part of the CNG pressure regulator shall be leak-proof (see Annex 5B)
at a pressure up to twice the working pressure.
3.1.4. The Class 1 and Class 2 part of the CNG pressure regulator shall withstand a pressure up to
twice the working pressure.
3.1.5. The Class 3 part of the CNG pressure regulator shall withstand a pressure up to twice the relief
pressure of the pressure relief valve, on which it is subject.
3.2. The part of the pressure regulator which is in contact with pressure higher than 26MPa is
regarded as Class 6.
3.2.1. The Class 6 part of the pressure regulator shall be leak-proof (see Annex 5B) at a pressure up
to 1.5 times the working pressure (MPa) with the outlet(s) of that part closed off.
3.2.2. The Class 6 part of the pressure regulator shall withstand a pressure up to 1.5 times the
working pressure (MPa).
3.2.3. The part of the pressure regulator that is in contact with pressure below 26MPa is classified as
per Part I, Section 3, of this Regulation.
3.2.3.1. The Class 0 part of the pressure regulator shall be leak-proof (see Annex 5B) at a pressure up
to 1.5 times the working pressure (MPa) with the outlet(s) of that part closed off.
3.2.3.2. The Class 0 part of the pressure regulator shall withstand a pressure up to 1.5 times the
working pressure (MPa).
3.2.3.3. The Class 1 and Class 2 part of the CNG pressure regulator shall be leak-proof (see Annex 5B)
at a pressure up to twice the working pressure.
3.2.3.4. The Class 1 and Class 2 part of the CNG pressure regulator shall withstand a pressure up to
twice the working pressure.
3.2.3.5. The Class 3 part of the CNG pressure regulator shall withstand a pressure up to twice the relief
pressure of the pressure relief valve, on which it is subject.
3.3. The pressure regulator shall be so designed to operate at temperatures as specified in
Annex 5O.

ANNEX 4F
PROVISIONS REGARDING THE APPROVAL OF THE CNG FILLING UNIT
(RECEPTACLE)
1. The purpose of this Annex is to determine the provisions regarding the approval of the CNG
filling unit.
2. THE CNG FILLING UNIT
2.1. The CNG filling unit shall comply with the requirements laid down in Paragraph 3. below and
shall have the dimensions of Paragraph 4. below.
2.2. CNG filling units designed in accordance with ISO 14469-1 first edition 2004-11-01 or
ISO 14469-2 : 2007 and meeting all the requirements therein are deemed to fulfil the
requirements of Paragraphs 3. and 4. of this Annex.
3. THE CNG FILLING UNIT TEST PROCEDURES
3.1. The CNG filling unit shall conform to the requirements of Class 0 and follow the test procedures
in Annex 5 with the following specific requirements.
3.2. The material constituting the CNG filling unit which is in contact with the CNG when the device
is in service shall be compatible with the CNG. In order to verify this compatibility, the
procedure of Annex 5D shall be used.
3.3. The CNG filling unit shall be free from leakage at a pressure of 1.5 times the working pressure
(MPa) (see Annex 5B).
3.4. The CNG filling unit shall withstand a pressure of 33MPa.
3.5. The CNG filling unit shall be so designed to operate at temperatures as specified in Annex 5O.
3.6. The CNG filling unit shall withstand a number of 10,000 cycles in the durability test specified in
Annex 5L.
4. CNG FILLING UNIT DIMENSIONS
4.1. Figure 1 shows the dimensions of the filling unit for vehicles of Categories M and N .
4.2. Figure 2 shows the dimensions of the filling unit for vehicles of Categories M , M , N and N .

Figure 2
20MPa Filling Unit Size 2 (receptacle) for M , M , N and N Vehicles

3.3. Test Pressures
3.3.1. The CNG gas flow adjuster of Class 2 shall withstand a pressure twice the working pressure.
3.3.1.1. The CNG gas flow adjuster of Class 2 shall be free from leakage at a pressure twice the
working pressure.
3.3.2. The CNG gas flow adjuster of Class 1 and Class 2 shall be so designed to operate at
temperatures as specified in Annex 5O.
3.4. Electrical operated components containing CNG shall comply with the following:
(a)
(b)
They shall have a separate ground connection;
The electrical system of the component shall be isolated from the body.

ANNEX 4I
PROVISIONS ON THE APPROVAL OF THE LNG HEAT EXCHANGER – VAPORIZER
1. The purpose of this Annex is to determine the provisions on the approval of the LNG heat
exchanger – vaporizer.
2. LNG HEAT EXCHANGER – VAPORIZER
2.1. The LNG heat exchanger – vaporizer can be any device made for vaporizing the cryogenic
liquid fuel and deliver it as gas to the engine with gas temperature between -40°C and +105°C.
2.2. The material constituting the LNG heat exchanger - vaporizer which is in contact with the CNG
when operating shall be compatible with the test CNG. In order to verify this compatibility, the
procedure in Annex 5D shall be used.
2.3. The part of the LNG heat exchanger - vaporizer which is in contact with the tank is regarded as
Class 5.
2.4. The LNG heat exchanger – vaporizer shall be so designed as to withstand a pressure of 1.5
times the working pressure (MPa) without leakage and deformation.
2.5. The LNG heat exchanger – vaporizer shall be so designed as to be leak-proof (external) at a
pressure of 1.5 times the working pressure (MPa) (see Annex 5B).
2.6. The LNG heat exchanger – vaporizer shall be so designed to operate at temperatures as
specified in Annex 5O.
2.7. The LNG heat exchanger – vaporizer has to comply with the test procedures for the Class 5.
2.8. The LNG heat exchanger – vaporizer has to comply with the water jacket freezing test. Fill the
part of the heat exchanger-vaporizer which normally contains an antifreeze solution, with water
to normal capacity and expose it at -40°C for 24H. Attach 1m sections of coolant hose to the
coolant inlet and outlet of the heat exchanger – vaporizer. Following the freezing conditioning,
conduct an external leakage test according to Annex 5B at room temperature. A separate
sample may be used for this test.

3.1.4.3. High Temperature Cycling
The component shall be operated through 2% of the total cycles as above at the appropriate
maximum temperature specified at rated service pressure. The component shall comply with
the leakage test of Annex 5B at the high temperature at the completion of the high temperature
cycles.
Following cycling and leakage re-test, the component shall be capable of removal of the filling
nozzle without spilling more than 30cm LNG.
3.1.5. The LNG filling receptacle shall be made out of non-sparking material and should comply with
the no igniting evaluation tests described in ISO 14469-1:2004.
3.1.6. The electrical resistance of the connected LNG filling receptacle and nozzle shall not be greater
than 10Ω either in the pressurized and un-pressurized state. Test shall be conducted prior to
and after the endurance test.

ANNEX 4L
PROVISIONS ON THE APPROVAL OF LNG PRESSURE AND/OR TEMPERATURE SENSOR
1. The purpose of this Annex is to determine the provisions on the approval of the LNG pressure
and/or temperature sensor.
2. LNG PRESSURE AND TEMPERATURE SENSORS.
2.1. The LNG pressure and temperature sensors are classified in Class 5 according to the
Scheme 1-1 in Paragraph 3. of this Regulation.
3. The LNG pressure and/or temperature sensor test procedures.
3.1 The LNG pressure and/or temperature sensor test procedures shall conform to the
requirements of Class 5 and follow the test procedures in Annex 5 with the following specific
requirements.
3.2. Insulation Resistance Test.
This test is designed to check for a potential failure of the insulation between the LNG pressure
and/or temperature sensor connection pins and the housing.
Apply 1,000V DC between one of the connector pins and the housing of the LNG pressure
and/or temperature sensor for at least 2s. The minimum allowable resistance shall be >10MΩ.
3.3. The material constituting the LNG pressure and temperature sensors which are in contact with
the LNG when operating shall be compatible with the test LNG. In order to verify this
compatibility, the procedure in Annex 5D shall be used.
3.4. The LNG pressure and/or temperature sensor shall be so designed as to operate at
temperatures as specified in Annex 5O.
3.5. The Class 5 part of the LNG pressure and temperature sensors shall withstand a pressure up
to 1.5 times the working pressure (MPa), at the temperature corresponding to rated service
pressure from the table in Annex 5O, at room temperature and at the maximum temperature
from Annex 5O.

ANNEX 4N
PROVISIONS ON THE APPROVAL OF THE AUTOMATIC VALVE, CHECK VALVE, PRESSURE
RELIEF VALVE, EXCESS FLOW VALVE, MANUAL VALVE AND NON-RETURN VALVE
FOR LNG APPLICATIONS.
1. The purpose of this Annex is to determine the provisions on the approval of the automatic
valve, the check valve, the pressure relief valve and the excess flow valve only for LNG
applications.
2. THE LNG AUTOMATIC VALVE
2.1. The materials constituting the LNG automatic valve, which are in contact with the LNG when
operating, shall be compatible with the test LNG. In order to verify this compatibility the
procedure described in Annex 5D shall be used.
2.2. Operating Specifications
2.2.1. The LNG automatic valve shall be so designed as to withstand a pressure of 1.5 times the
working pressure (MPa) without leakage or deformation (see Annex 5A).
2.2.2. The LNG automatic valve shall be so designed as to be leak-proof at a pressure of 1.5 times
the working pressure (MPa) (see Annex 5B).
2.2.3. The LNG automatic valve, being in the normal position of use specified by the manufacturer, is
submitted to 7,000 operations; then it is deactivated. The automatic valve shall remain leakproof
according to Annex 5B and 5C at a pressure of 1.5 times the working pressure. This test
is performed for 96% of its cycles at cryogenic temperatures, 2% at ambient temperature and
2% at high temperature according to the table in Annex 5O.
2.2.4. The LNG automatic valve shall be so designed to operate at temperatures as specified in
Annex 5O.
2.2.5. The Insulation Resistance Test.
This test is designed to check for a potential failure of the insulation between the two-pin coil
assembly and the LNG automatic valve casing.
Apply 1,000V DC between one of the connector pins and the housing of the automatic valve for
at least 2s. The minimum allowable resistance shall be 10MΩ.
3. THE LNG CHECK VALVE
3.1. The materials constituting the LNG check valve which are in contact with the LNG when
operating, shall be compatible with the test LNG. In order to verify this compatibility the
procedure described in Annex 5D shall be used.
3.2. Operating Specifications
3.2.1. The LNG check valve shall be so designed as to withstand a pressure of 1.5 times the working
pressure (MPa) without leakage and deformation at cryogenic temperature.

5.4. An excess flow valve shall operate at not more than 10% above, nor less than 20% below the
rated closing mass flow capacity specified by the manufacturer.
5.4.1. Three samples of each size and style of valve are to be subjected to these tests. The LNG
valve intended for use only with liquid is to be tested with water. Except as indicated in
Paragraph 5.4.3. below, separate tests are to be run with each sample installed in vertical,
horizontal and inverted positions.
5.4.2. The test with water is to be conducted using a liquid flow meter (or equivalent) installed in a
piping system having sufficient pressure to provide the required flow.
The system is to include an inlet piezometer or pipe at least one pipe size larger than the valve
to be tested, with a flow control valve connected between the flow meter and piezometer. A
hose or hydrostatic relief valve, or both, may be used to reduce the effect of the pressure shock
when the excess flow valve closes.
5.4.3. A valve intended for installation in one position only may be tested only in that position.
5.5. When the LNG excess flow valve is at cut-off position, the by-pass flow through the valve shall
not exceed an airflow rate declared by the manufacturer in cm3/minute at service pressure.
5.6. The device shall comply with the test procedures for the Class 5 components.
6. THE LNG MANUAL VALVE
6.1. The materials constituting the LNG manual valve which are in contact with the LNG when
operating, shall be compatible with the test LNG. In order to verify this compatibility, the
procedure described in Annex 5D shall be used.
6.2. Operating Specifications
6.2.1. The LNG manual valve device in Class 5 shall be designed to withstand a pressure of 1.5 times
the working pressure at cryogenic temperature.
6.2.2. The LNG manual valve device in Class 5 shall be designed to operate at a temperature from -
162°C to 85°C.
6.3. LNG Manual Valve Device Requirements
One specimen shall be submitted to a fatigue test at a pressure-cycling rate not to exceed 4
cycles a minute as follows:
Held at -162°C or lower while pressured for 100 cycles between 0 and working pressure WP.
The maximum torque on the valve shall than comply with 2 times the force mentioned in
Table 5.3 in Annex 5L. After the test the
LNG manual valve shall comply with the external leak test in Annex 5B. If during this test icing
occurs, the LNG manual valve may be de-iced and dried.
6.4. The LNG manual valve has to comply with the test procedures for the Class 5 component.

3. APPLICABLE TEST PROCEDURES:
3.1. LNG Fuel Pump Mounted Inside the Tank:
LNG compatibility test
Resistance to dry heat
Ozone ageing
Low temperature test
Annex 5D
Annex 5F
Annex 5G
Annex 5P
3.2. LNG Fuel Pump Mounted Outside the Tank:
Overpressure or strength
External leakage
LNG compatibility
Corrosion resistance
Resistance to dry heat
Ozone ageing
Temperature cycle
Vibration resistance
Low temperature test
Annex 5A
Annex 5B
Annex 5D
Annex 5E
Annex 5F
Annex 5G
Annex 5H
Annex 5N
Annex 5P

Remarks:
(a)
(b)
(c)
(d)
(e)
Internal leakage: Applicable if the Class of the component consists of internal valve seats
that are normally closed during engine "OFF" condition.
Durability test: Applicable if the Class of the component consists of integral parts that will
move repeatedly during engine operation.
CNG compatibility, resistance to dry heat, ozone ageing: Applicable if the class of the
component consists of synthetic/non-metallic parts.
Temperature cyclic test: Applicable if the class of the component consists of
synthetic/non-metallic parts.
Vibration resistance test: Applicable if the Class of the component consists of integral
parts that will move repeatedly during engine operation.
The materials used for the components shall have written specifications that fulfil at least or
exceed the (test) requirements laid down in this Annex with respect to:
(a)
(b)
(c)
(d)
temperature
pressure
CNG/LNG compatibility
durability
3. GENERAL REQUIREMENTS
3.1. Leakage tests shall have to be conducted with pressurised gas like air or nitrogen for CNG. For
LNG, cryogenic fluid shall be used.
3.2. Water or another fluid may be used to obtain the required pressure for the hydrostatic strength
test.
3.3. The test period for leakage test and the hydrostatic strength-tests shall be not less than 3min.

ANNEX 5B
EXTERNAL LEAKAGE TEST
1. A component shall be free from leakage through stem or body seals or other joints, and shall
not show evidence of porosity in casting when tested as described in Paragraphs 2. and 3. of
this Annex at any aerostatic pressure between 0 and the pressure shown in Table 5.2 of
Annex 5A.
2. The test shall be performed at the following conditions:
(a)
(b)
(c)
at room temperature
at the minimum operating temperature
at the maximum operating temperature
The maximum and minimum operating temperatures are given in Annex 5O.
3. FOR CNG
During this test the equipment under test (EUT) will be connected to a source of aerostatic
pressure. An automatic valve and a pressure gauge having a pressure range of not less than
1.5 times nor more than 2 times the test pressure are to be installed in the pressure supply
piping. The pressure gauge is to be installed between the automatic valve and the sample
under test. While under the applied test pressure, the sample should be submerged in water to
detect leakage or any other equivalent test method (flow measurement or pressure drop).
3.1. For LNG
During this test the inlet of the component is connected to a source of cryogenic fluid according
to the table in Annex 5O or lower temperature with the working pressure as declared by the
manufacture. The flow is maintained for 0.5h.
4. The external leakage shall be lower than the requirements stated in the annexes or if no
requirements are mentioned the external leakage shall be lower than 15cm /h.
5. HIGH TEMPERATURE TEST
For CNG
A CNG containing component shall not leak more than 15cm /h with the outlet plugged when
submitted to a gas pressure, at maximum operating temperature as indicated in Annex 5O,
equal to the maximum working pressure. The component shall be conditioned for at least 8h at
this temperature.
5.1 For LNG
A LNG containing component shall not leak more than 15cm /h with the flow mentioned in
Paragraph 3.1. in place when submitted to an outside temperature at the maximum operating
temperatures mentioned in Annex 5O.

ANNEX 5C
INTERNAL LEAKAGE TEST
1. The following tests are to be conducted on samples of valves or filling unit which have
previously been subjected to the external leak test of Annex 5B above.
2. The seat of the valves, when in the closed position, shall be free from leakage at any aerostatic
pressure between 0 to 1.5 times the working pressure (kPa). For LNG components, the
temperature used is the cryogenic temperature (see Annex 5O).
3. A CNG non-return valve provided with a resilient seat (elastic), when in the closed position,
shall not leak when subjected to any aerostatic pressure between 0 and 1.5 times the working
pressure (kPa).
4. A CNG non-return valve provided with a metal-to-metal seat, when in the closed position, shall
not leak at a rate exceeding 0.47dm /s when subjected to an aerostatic pressure difference of
138kPa effective pressure.
5. The seat of the upper CNG non-return valve used in the assembly of a filling unit, when in the
closed position, shall be free from leakage at any aerostatic pressure between 0 and 1.5 times
the working pressure (kPa).
6. The internal leakage tests are conducted with the inlet of the sample valve connected to a
source of aerostatic pressure, the valve in the closed position, and with the outlet open. An
automatic valve and a pressure gauge having a pressure range of not less than 1.5 times nor
more than 2 times the test pressure are to be installed in the pressure supply piping. The
pressure gauge is to be installed between the automatic valve and the sample under test.
While under the applied test pressure, observations for leakage are to be made with the open
outlet submerged in water unless otherwise indicated.
7. Compliance with Paragraphs 2. to 5. above is to be determined by connecting a length of
tubing to the valve outlet. The open end of this outlet tube is to be located within an inverted
graduated cylinder which is calibrated in cubic centimetres. The inverted cylinder is to be
closed by a water tight seal. The apparatus is to be adjusted so that:
(a)
(b)
the end of the outlet tube is located approximately 13mm above the water level within the
inverted graduated cylinder, and
the water within and exterior to the graduated cylinder is at the same level. With these
adjustments made, the water level within the graduated cylinder is to be recorded. With
the valve in the closed position assumed as the result of normal operation, air or nitrogen
at the specified test pressure is to be applied to the valve inlet for a test period of not less
than 2min. During this time, the vertical position of the graduated cylinder is to be
adjusted, if necessary, to maintain the same water level within and exterior to it.

ANNEX 5D
CNG/LNG COMPATIBILITY TEST
1. A synthetic part in contact with CNG/LNG shall not show excessive volume change or loss of
weight.
Resistance to n-pentane according to ISO 1817 with the following conditions:
(a)
medium: n-pentane
(b) temperature: 23°C (tolerance according to ISO 1817)
(c)
immersion period: 72hr
2. Requirements:
maximum change in volume 20%
After storage in air with a temperature of 40°C for a period of 48h the mass compared to the
original value may not decrease more than 5%.

ANNEX 5F
RESISTANCE TO DRY-HEAT
1. The test has to be done in compliance with ISO 188. The test piece has to be exposed to air at
a temperature equal to the maximum operating temperature for 168h.
2. The allowable change in tensile strength should not exceed +25%. The allowable change in
ultimate elongation shall not exceed the following values:
(a) Maximum increase 10%
(b) Maximum decrease 30%

ANNEX 5H
TEMPERATURE CYCLE TEST
A non metallic part containing CNG/LNG shall comply with the leakage tests mentioned in Annexes 5B
and 5C after having been submitted to 96h temperature cycle from the minimum operating temperature
up to the maximum operating temperature with a cycle time of 120min, under maximum working
pressure.
ANNEX 5I
PRESSURE CYCLE TEST APPLICABLE ONLY TO CYLINDERS (SEE ANNEX 3)
ANNEXES 5J AND 5K – NOT ALLOCATED

ANNEX 5M
BURST/DESTRUCTIVE TEST APPLICABLE ONLY TO CNG CYLINDERS (SEE ANNEX 3A)
ANNEX 5N
VIBRATION RESISTANCE TEST
1. All components with moving parts shall remain undamaged, continue to operate, and comply
with the component's leakage tests after 6h of vibration in accordance with the following test
method.
2. TEST METHOD
2.1. The component shall be secured in an apparatus and vibrated for 2h at 17Hz with an amplitude
of 1.5mm (0.06in) in each of three orientation axes. On completion of 6h of vibration the
component shall comply with Annex 5C.

ANNEX 5P
LNG – LOW TEMPERATURE TEST
1. The component shall be operated through 96% of the total cycles (given in the Annex 4 of the
product) at less -162°C temperature and working pressure.
2. The component shall be operated through 4% of the total cycles at the appropriate maximum
temperature (specified in Annex 5O) and working pressure and shall comply with Annexes 5B
and 5C at the completion of the temperature cycles.
3. This test may be interrupted, if desired, at 20% intervals for leakage testing.
4. Following cycling testing, perform the hydrostatic test.

ANNEX 6
PROVISIONS ON CNG IDENTIFICATION MARK FOR VEHICLES OFF CATERGORIES M AND M , N
AND N
(Paragraph 18.1.8.1. of this Regulation)
The sign consists of a sticker which shall be weather resistant.
The colour and dimensions of the sticker shall fulfil the following requirements:
Colours:
Background:
Border:
Letters:
Dimensions
Border width:
Character height:
Character thickness:
Sticker width:
Sticker height:
green
white or white reflecting
white or white reflecting
4 - 6mm
≥25mm
≥4mm
110 - 150mm
80 - 110mmm
The word "CNG" shalll be centred in the middlee of the sticker.

Compressed Natural Gas (CNG) and/or Liquefied Natural Gas (LNG) Vehicles.